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17 results on '"Laboratory for Astroparticle Physics"'

1. Measurement of negatively charged pion spectra in inelastic p+p interactions at <math><mrow><msub><mi>p</mi><mi mathvariant='bold'>lab</mi></msub><mo>=</mo></mrow></math> 20, 31, 40, 80 and 158 GeV/c

Author

Abgrall, N.University of Geneva, Geneva, Switzerland, Aduszkiewicz, A.(Faculty of Physics, University of Warsaw, Warsaw, Poland), Ali, Y.(Jagiellonian University, Cracow, Poland), Anticic, T.(Rudjer Bošković Institute, Zagreb, Croatia), Antoniou, N.(University of Athens, Athens, Greece), Baatar, B.(Joint Institute for Nuclear Research, Dubna, Russia), Bay, F.(ETH, Zurich, Switzerland), Blondel, A.(University of Geneva, Geneva, Switzerland), Blumer, J.(Karlsruhe Institute of Technology, Karlsruhe, Germany), Bogomilov, M.(Faculty of Physics, University of Sofia, Sofia, Bulgaria), Bravar, A.(University of Geneva, Geneva, Switzerland), Brzychczyk, J.(Jagiellonian University, Cracow, Poland), Bunyatov, S. A.(Joint Institute for Nuclear Research, Dubna, Russia), Busygina, O.(Institute for Nuclear Research, Moscow, Russia), Christakoglou, P.(University of Athens, Athens, Greece), Czopowicz, T.(Warsaw University of Technology, Warsaw, Poland), Davis, N.(University of Athens, Athens, Greece), Debieux, S.(University of Geneva, Geneva, Switzerland), Dembinski, H.(Karlsruhe Institute of Technology, Karlsruhe, Germany), Diakonos, F.(University of Athens, Athens, Greece), Luise, S. Di(ETH, Zurich, Switzerland), Dominik, W.(Faculty of Physics, University of Warsaw, Warsaw, Poland), Drozhzhova, T.(St. Petersburg State University, St. Petersburg, Russia), Dumarchez, J.(LPNHE, University of Paris VI and VII, Paris, France), Dynowski, K.(Warsaw University of Technology, Warsaw, Poland), Engel, R.(Karlsruhe Institute of Technology, Karlsruhe, Germany), Ereditato, A.(University of Bern, Bern, Switzerland), Feofilov, G. A.(St. Petersburg State University, St. Petersburg, Russia), Fodor, Z.(KFKI Research Institute for Particle and Nuclear Physics, Budapest, Hungary), Fulop, A.(KFKI Research Institute for Particle and Nuclear Physics, Budapest, Hungary), Gaździcki, M.(Jan Kochanowski University in Kielce, Kielce, Poland), Golubeva, M.(Institute for Nuclear Research, Moscow, Russia), Grebieszkow, K.(Warsaw University of Technology, Warsaw, Poland), Grzeszczuk, A.(University of Silesia, Katowice, Poland), Guber, F.(Institute for Nuclear Research, Moscow, Russia), Haesler, A.(University of Geneva, Geneva, Switzerland), Hasegawa, T.(High Energy Accelerator Research Organization (KEK), 305-0801, Tsukuba, Ibaraki, Japan), Hierholzer, M.(University of Bern, Bern, Switzerland), Idczak, R.(University of Wrocław, Wrocław, Poland), Igolkin, S.(St. Petersburg State University, St. Petersburg, Russia), Ivashkin, A.(Institute for Nuclear Research, Moscow, Russia), Joković, D.(University of Belgrade, Belgrade, Serbia), Kadija, K.(Rudjer Bošković Institute, Zagreb, Croatia), Kapoyannis, A.(University of Athens, Athens, Greece), Kaptur, E.(University of Silesia, Katowice, Poland), Kiełczewska, D.(Faculty of Physics, University of Warsaw, Warsaw, Poland), Kirejczyk, M.(Faculty of Physics, University of Warsaw, Warsaw, Poland), Kisiel, J.(University of Silesia, Katowice, Poland), Kiss, T.(KFKI Research Institute for Particle and Nuclear Physics, Budapest, Hungary), Kleinfelder, S.(University of California, Irvine, USA), Kobayashi, T.(High Energy Accelerator Research Organization (KEK), 305-0801, Tsukuba, Ibaraki, Japan), Kolesnikov, V. I.(Joint Institute for Nuclear Research, Dubna, Russia), Kolev, D.(Faculty of Physics, University of Sofia, Sofia, Bulgaria), Kondratiev, V. P.(St. Petersburg State University, St. Petersburg, Russia), Korzenev, A.(University of Geneva, Geneva, Switzerland), Kovesarki, P.(University of Wrocław, Wrocław, Poland), Kowalski, S.(University of Silesia, Katowice, Poland), Krasnoperov, A.(Joint Institute for Nuclear Research, Dubna, Russia), Kurepin, A.(Institute for Nuclear Research, Moscow, Russia), Larsen, D.(University of Silesia, Katowice, Poland), László, A.(KFKI Research Institute for Particle and Nuclear Physics, Budapest, Hungary), Lyubushkin, V. V.(Joint Institute for Nuclear Research, Dubna, Russia), Maćkowiak-Pawłowska, M.(University of Frankfurt, Frankfurt, Germany), Majka, Z.(Jagiellonian University, Cracow, Poland), Maksiak, B.(Warsaw University of Technology, Warsaw, Poland), Malakhov, A. I.(Joint Institute for Nuclear Research, Dubna, Russia), Manić, D.(University of Belgrade, Belgrade, Serbia), Marcinek, A.(Jagiellonian University, Cracow, Poland), Marin, V.(Institute for Nuclear Research, Moscow, Russia), Marton, K.(KFKI Research Institute for Particle and Nuclear Physics, Budapest, Hungary), Mathes, H.-J.(Karlsruhe Institute of Technology, Karlsruhe, Germany), Matulewicz, T.(Faculty of Physics, University of Warsaw, Warsaw, Poland), Matveev, V.(Joint Institute for Nuclear Research, Dubna, Russia), Melkumov, G. L.(Joint Institute for Nuclear Research, Dubna, Russia), Mrówczyński, St.(Jan Kochanowski University in Kielce, Kielce, Poland), Murphy, S.(University of Geneva, Geneva, Switzerland), Nakadaira, T.(High Energy Accelerator Research Organization (KEK), 305-0801, Tsukuba, Ibaraki, Japan), Nirkko, M.(University of Bern, Bern, Switzerland), Nishikawa, K.(High Energy Accelerator Research Organization (KEK), 305-0801, Tsukuba, Ibaraki, Japan), Palczewski, T.(National Centre for Nuclear Research, Warsaw, Poland), Palla, G.(KFKI Research Institute for Particle and Nuclear Physics, Budapest, Hungary), Panagiotou, A. D.(University of Athens, Athens, Greece), Paul, T.(Laboratory of Astroparticle Physics, University Nova Gorica, Nova Gorica, Slovenia), Pistillo, C.(University of Bern, Bern, Switzerland), Peryt, W.(Warsaw University of Technology, Warsaw, Poland), Petukhov, O.(Institute for Nuclear Research, Moscow, Russia), Płaneta, R.(Jagiellonian University, Cracow, Poland), Pluta, J.(Warsaw University of Technology, Warsaw, Poland), Popov, B. A.(Joint Institute for Nuclear Research, Dubna, Russia), Posiadała, M.(Faculty of Physics, University of Warsaw, Warsaw, Poland), Puławski, S.(University of Silesia, Katowice, Poland), Puzović, J.(University of Belgrade, Belgrade, Serbia), Rauch, W.(Fachhochschule Frankfurt, Frankfurt, Germany), Ravonel, M.(University of Geneva, Geneva, Switzerland), Redij, A.(University of Bern, Bern, Switzerland), Renfordt, R.(University of Frankfurt, Frankfurt, Germany), Robert, A.(LPNHE, University of Paris VI and VII, Paris, France), Röhrich, D.(University of Bergen, Bergen, Norway), Rondio, E.(National Centre for Nuclear Research, Warsaw, Poland), Roth, M.(Karlsruhe Institute of Technology, Karlsruhe, Germany), Rubbia, A.(ETH, Zurich, Switzerland), Rustamov, A.(University of Frankfurt, Frankfurt, Germany), Rybczyński, M.(Jan Kochanowski University in Kielce, Kielce, Poland), Sadovsky, A.(Institute for Nuclear Research, Moscow, Russia), Sakashita, K.(High Energy Accelerator Research Organization (KEK), 305-0801, Tsukuba, Ibaraki, Japan), Savić, M.(University of Belgrade, Belgrade, Serbia), Schmidt, K.(University of Silesia, Katowice, Poland), Sekiguchi, T.(High Energy Accelerator Research Organization (KEK), 305-0801, Tsukuba, Ibaraki, Japan), Seyboth, P.(Jan Kochanowski University in Kielce, Kielce, Poland), Sgalaberna, D.(ETH, Zurich, Switzerland), Shibata, M.(High Energy Accelerator Research Organization (KEK), 305-0801, Tsukuba, Ibaraki, Japan), Sipos, R.(KFKI Research Institute for Particle and Nuclear Physics, Budapest, Hungary), Skrzypczak, E.(Faculty of Physics, University of Warsaw, Warsaw, Poland), Słodkowski, M.(Warsaw University of Technology, Warsaw, Poland), Staszel, P.(Jagiellonian University, Cracow, Poland), Stefanek, G.(Jan Kochanowski University in Kielce, Kielce, Poland), Stepaniak, J.(National Centre for Nuclear Research, Warsaw, Poland), Ströbele, H.(University of Frankfurt, Frankfurt, Germany), Šuša, T.(Rudjer Bošković Institute, Zagreb, Croatia), Szuba, M.(Karlsruhe Institute of Technology, Karlsruhe, Germany), Tada, M.(High Energy Accelerator Research Organization (KEK), 305-0801, Tsukuba, Ibaraki, Japan), Tereshchenko, V.(Joint Institute for Nuclear Research, Dubna, Russia), Tolyhi, T.(KFKI Research Institute for Particle and Nuclear Physics, Budapest, Hungary), Tsenov, R.(Faculty of Physics, University of Sofia, Sofia, Bulgaria), Turko, L.(University of Wrocław, Wrocław, Poland), Ulrich, R.(Karlsruhe Institute of Technology, Karlsruhe, Germany), Unger, M.(Karlsruhe Institute of Technology, Karlsruhe, Germany), Vassiliou, M.(University of Athens, Athens, Greece), Veberič, D.(Laboratory of Astroparticle Physics, University Nova Gorica, Nova Gorica, Slovenia), Vechernin, V. V.(St. Petersburg State University, St. Petersburg, Russia), Vesztergombi, G.(KFKI Research Institute for Particle and Nuclear Physics, Budapest, Hungary), Vinogradov, L.(St. Petersburg State University, St. Petersburg, Russia), Wilczek, A.(University of Silesia, Katowice, Poland), Włodarczyk, Z.(Jan Kochanowski University in Kielce, Kielce, Poland), Wojtaszek-Szwarc, A.(Jan Kochanowski University in Kielce, Kielce, Poland), Wyszyński, O.(Jagiellonian University, Cracow, Poland), Zambelli, L.(LPNHE, University of Paris VI and VII, Paris, France), and Zipper, W.(University of Silesia, Katowice, Poland)

Subjects
Nuclear Theory, High Energy Physics::Experiment, Nuclear Experiment
Abstract

We present experimental results on inclusive spectra and mean multiplicities of negatively charged pions produced in inelastic p+p interactions at incident projectile momenta of 20, 31, 40, 80 and 158 GeV/ c ( s= 6.3, 7.7, 8.8, 12.3 and 17.3 GeV, respectively). The measurements were performed using the large acceptance NA61/SHINE hadron spectrometer at the CERN super proton synchrotron. Two-dimensional spectra are determined in terms of rapidity and transverse momentum. Their properties such as the width of rapidity distributions and the inverse slope parameter of transverse mass spectra are extracted and their collision energy dependences are presented. The results on inelastic p+p interactions are compared with the corresponding data on central Pb+Pb collisions measured by the NA49 experiment at the CERN SPS. The results presented in this paper are part of the NA61/SHINE ion program devoted to the study of the properties of the onset of deconfinement and search for the critical point of strongly interacting matter. They are required for interpretation of results on nucleus–nucleus and proton–nucleus collisions.

Published
2014

2. Improved limit to the diffuse flux of ultrahigh energy neutrinos from the Pierre Auger Observatory

Author

J. J. Masías Meza, S. Messina, D. Maurel, S. Müller, Nicusor Arsene, A. Tapia, H. Gemmeke, C. Aramo, J. Kleinfeller, Johannes Schulz, A. Gorgi, M. Pimenta, Kai Daumiller, A. ͆miałkowski, Q. Dorosti Hasankiadeh, Paul Sommers, A. Blanco, P. Gouffon, M. J. Cooper, F. Sánchez, Carlos Medina, Yogendra N. Srivastava, M. I. Micheletti, Daniel Kuempel, Carlos Escobar, B. Revenu, Benedikt Zimmermann, Rúben Conceição, R. Vasquez, Maria Rita Coluccia, K. Link, J. Stapleton, B. Mitrica, Heino Falcke, T. Huege, R. Mussa, J. J. Beatty, J. Vicha, A. Cordier, S. Maldera, D. Nitz, J. R. Vázquez, Jeffrey Brack, Olaf Scholten, Humberto Ibarguen Salazar, Yingchun Zhu, P. Sanchez-Lucas, H. Dembinski, N. Fazzini, Ivone F. M. Albuquerque, Ke Fang, Miroslav Hrabovský, L. Perrone, Jiri Chudoba, A. Haungs, J. L. Harton, S. G. Blaess, Azadeh Keivani, A. Aab, L. Caramete, Alex Kääpä, D. Torres Machado, W. Rodrigues de Carvalho, Richard Dallier, A. Nelles, D. Harari, F. Gate, Jaime Alvarez-Muñiz, Miguel Mostafa, Lorenzo Caccianiga, V. M. Theodoro, M. E. Bertaina, B. García, A. Menshikov, Colin Baus, Tobias Winchen, P. Lebrun, R. López, Karen S. Caballero-Mora, J. W. Cronin, Alexandru Gherghel-Lascu, Marcio Aparecido Muller, P. Mantsch, L. Tomankova, Thomas Harrison, M. Zavrtanik, G. Navarra, A. López Casado, Brian Fick, Samo Stanič, Z. Szadkowski, G. C. Hill, Ralph Engel, J. Ridky, G. S. Varner, H. Schieler, Julien Aublin, F. Werner, P. van Bodegom, M. Fernandes, G. Toma, Nataliia Borodai, Karl-Heinz Kampert, Y. Guardincerri, P. Pieroni, V. M. Aranda, Alina Mihaela Badescu, S. Hartmann, Martin Erdmann, Michael Unger, K. Weidenhaupt, A. Stutz, A. van Vliet, Lu Lu, Luca Latronico, Eric Mayotte, Paula Gina Isar, Antonella Castellina, Petr Schovanek, J. F. Valdés Galicia, Pedro Brogueira, F. Salesa Greus, I. De Mitri, I. A. Minaya, B. Keilhauer, G. Cataldi, Dieter Heck, G. Golup, P. Heimann, M. Gómez Berisso, F. Arqueros, N. Kunka, B. Tome, P. Necesal, A. Porcelli, G. Müller, S. J. De Jong, M. Prouza, André Schulz, R. C. Shellard, W. Docters, Martina Bohacova, P. E. Ghia, M. Ambrosio, M. Avenier, Patrick Allison, Roger W Clay, G. Matthiae, A. C. Fauth, P. Abreu, D. Ravignani, A.M. van den Berg, Peter Hansen, Darko Veberič, F. Guarino, John Matthews, E. Kemp, Serguei Vorobiov, G. Cocciolo, Corbin Covault, B. Vlcek, Dariusz Glas, Y. Petrov, Matías Rolf Hampel, Carola Dobrigkeit, Ugo Giaccari, M. Plum, J. Sorokin, Alexander Grillo, J. Stasielak, S. Coutu, Peter Schiffer, V. Scherini, Denis Stanca, K. Louedec, Mariangela Settimo, Jose Chinellato, Fred Sarazin, Alexey Yushkov, P. Lautridou, Peter Buchholz, Luis A. Anchordoqui, Lino Miramonti, A. Widom, J. A.J. Matthews, Xavier Bertou, J. R. T. de Mello Neto, A. Zepeda, F. Suarez, Thomas Hebbeker, Sergio Dasso, Alexandra Saftoiu, V. Purrello, H. Blümer, Antonio Bueno, Markus Risse, O. A. Taborda, B. D. Fox, Alan Watson, Mihai Niculescu-Oglinzanu, M. L. Díaz Castro, G. Farrar, I.M. Brancus, M. D. Rodríguez-Frías, Pedro Assis, Francesca Zuccarello, Martín Miguel Freire, L. Molina-Bueno, D. Melo, H. Glass, A. Etchegoyen, J. Alvarez Castillo, Jan Pękala, A. Chiavassa, H. Martinez, A. Letessier-Selvon, Max Malacari, Lili Yang, David Walz, Piotr Homola, A. E. Herve, K. B. Barber, M. Platino, Guenter Sigl, F. Diogo, Javier Tiffenberg, Marco Aglietta, Lukas Middendorf, Iuri Muniz Pepe, L. R. Wiencke, C. Porowski, I. Jandt, D. Pakk Selmi-Dei, J. D. Swain, A. Dorofeev, Lorenzo Cazon, R. M. de Almeida, M. Josebachuili, Dusan Mandat, Carla Bonifazi, Jose A. Bellido, C. Jarne, Christine Peters, A. Tepe, Corinne Berat, M. Giller, Ralf Ulrich, Maurice Stephan, M. Blanco, Gualberto Avila, S. Le Coz, R. Sato, Lourenco Lopes, Denise Boncioli, M. Kleifges, D. Zavrtanik, L. del Peral, M. Buscemi, Igor Katkov, Ingomar Allekotte, M. Mallamaci, O. Ravel, E. Petermann, O. Krömer, David Wittkowski, Balázs Kégl, G. Rodriguez Fernandez, Jaime Rosado, Miroslav Pech, S. Jansen, G. Salina, A. Tonachini, Danielle LaHurd, Olivier Deligny, Rodrigo Pelayo, Marcus Niechciol, G. Parente, Stijn Buitink, Hernán Asorey, N. Awal, Angela V. Olinto, C. Di Giulio, Alberto Daniel Supanitsky, D. Martraire, C. Hojvat, Jan Ebr, M. A. Leigui de Oliveira, S. Navas, R. Cester, L. Villaseñor, P.F. Gómez Vitale, D. Maurizio, J. L. Navarro, Joshua A. Gordon, R. A. Vázquez, C. Scarso, Pavel Horvath, Philipp Papenbreer, Iván Sidelnik, M. S. Sutherland, L. Martin, J. S. Díaz, Petr Travnicek, A. Filipčič, L. Nožka, E.M. Holt, M. Urban, D. Nosek, S. Querchfeld, R. Piegaia, A. C. Rovero, Alan Coleman, Marco Cilmo, R. Meyhandan, V. Novotny, J. Bäuml, Rossella Caruso, A. Lucero, C. Bleve, C. E. Moura, Trent D. Grubb, D. Huber, D. Rogozin, J. de Oliveira, A. Saleh, L. Niemietz, Alejandro Almela, J. Maller, S. Petrera, Marc Weber, Maria-Teresa Dova, H. J. Mathes, Juan Manuel Figueira, N. Pacheco, Valerio Pirronello, Roberta Colalillo, A. G. Mariazzi, B. Vargas Cárdenas, Sofia Andringa, Tim Niggemann, G. Marsella, Vincenzo Rizi, B. Gookin, T. Suomijärvi, J. Pallotta, P. H. Nguyen, A. Weindl, A. P. Ferguson, R. Alves Batista, S. Mathys, M. Erfani, D. Martello, Markus Roth, E. J. Quel, C. J. Todero Peixoto, E. M. Santos, M. Ziolkowski, Silvia Mollerach, N. Hollon, O. Martínez Bravo, Sarka Wykes, V. Verzi, O. Kambeitz, Bruce R. Dawson, Béatrice Fuchs, P.O. Mazur, Octavian Sima, David Schmidt, R. Meissner, S. Riggi, Niraj Dhital, I. Valiño, J. Rodriguez Rojo, D. Garcia-Pinto, N. Krohm, Octavian Fratu, A. Filevich, Eun-Joo Ahn, Johannes Schumacher, B. Sarkar, Christian Glaser, A. G. Chavez, D. Lebrun, M. Schauer, F.G. Schröder, Enrique Zas, J. Neuser, J. Espadanal, M. Palatka, V. B. B. Mello, H. Wilczyński, P. Billoir, François Montanet, Fernando Contreras, S. van Velzen, K. H. Becker, F. Salamida, R. Squartini, T. Paul, I. C. Mariş, Hernan Wahlberg, L. Nellen, M. Candusso, A. Bridgeman, G. Medina-Tanco, C. Morello, S. J. Saffi, Peter Gorham, G. van Aar, Charles Timmermans, R. R. Prado, L. Collica, A. Parra, H. E. Klages, A. Di Matteo, Markus Lauscher, Nicolas Martin Gonzalez, Peter L. Biermann, J. Phuntsok, Raul Sarmento, B. Wundheiler, Paolo Privitera, Gregory R Snow, R. J. Lauer, P. Ristori, P. H. Kasper, Harm Schoorlemmer, R. M. Kieckhafer, J. Rautenberg, O. Wainberg, W. C. Brown, B. Caccianiga, E. Varela, N. Griffith, Sergio Sciutto, L. Ochilo, G. De Mauro, Jörg R. Hörandel, M. Videla, I. Lhenry-Yvon, I. Al Samarai, Antonio Insolia, G. Torralba Elipe, Eva Santos, R. Krause, L. Valore, V. Marin, Amin Aminaei, G. P. Guedes, Toshihiro Fujii, Marco Giammarchi, A. Shadkam, Juan Carlos D'Olivo, T. Pierog, Esteban Roulet, Jeffrey A. Johnsen, S. Quinn, A. Segreto, Radomir Smida, M. Ave, V. de Souza, Bruno Daniel, T. Yapici, Foteini Oikonomou, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), Department of Astrophysics [Nijmegen], Institute for Mathematics, Astrophysics and Particle Physics (IMAPP), Radboud University [Nijmegen]-Radboud University [Nijmegen], Joseph Louis LAGRANGE (LAGRANGE), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Unité Scientifique de la Station de Nançay (USN), Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), Universidad de Buenos Aires [Buenos Aires] (UBA), Netherlands Institute for Radio Astronomy (ASTRON), Division Bajas Temperaturas (CAB-CNEA), Comisión Nacional de Energía Atómica [ARGENTINA] (CNEA), Lawrence Berkeley National Laboratory [Berkeley] (LBNL), Sydney Institute for Astronomy (SIfA), The University of Sydney, Karlsruher Institut für Technologie (KIT), Pennsylvania State University (Penn State), Penn State System, Istituto Nazionale di Fisica Nucleare, Sezione di Torino (INFN, Sezione di Torino), Istituto Nazionale di Fisica Nucleare (INFN), Istituto Nazionale di Fisica Nucleare, Sezione di Bologna (INFN, Sezione di Bologna), Laboratoire SUBATECH Nantes (SUBATECH), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), National Institute of Physics and Nuclear Engineering, Dipartimento di Fı'sica Generale dell'Università, Laboratoire de Physique Théorique et Modèles Statistiques (LPTMS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Division Applied Science, The Hebrew University of Jerusalem (HUJ), National Research Institute of Astronomy and Geophysics [Helwan] (NRIAG), Istituto di Astrofisica Spaziale e Fisica cosmica - Palermo (IASF-Pa), Istituto Nazionale di Astrofisica (INAF), Department of Physics, University of Bucharest (UniBuc), Vrije Universiteit Amsterdam [Amsterdam] (VU), University of Hawai‘i [Mānoa] (UHM), Laboratory for astroparticle physics (LAP-UNG), Laboratory for astroparticle physics, SLAC National Accelerator Laboratory (SLAC), Stanford University, Laboratoire Kastler Brossel (LKB (Jussieu)), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Department of Materials Science and Engineering [Korea], Myongji University, Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Aab, A., Abreu, P., Aglietta, M., Ahn, E. J., Al Samarai, I., Albuquerque, I. F. M., Allekotte, I., Allison, P., Almela, A., Alvarez Castillo, J., Alvarez Muñiz, J., Alves Batista, R., Ambrosio, M., Aminaei, A., Anchordoqui, L., Andringa, S., Aramo, C., Aranda, V. M., Arqueros, F., Arsene, N., Asorey, H., Assis, P., Aublin, J., Ave, M., Avenier, M., Avila, G., Awal, N., Badescu, A. M., Barber, K. B., Bäuml, J., Baus, C., Beatty, J. J., Becker, K. H., Bellido, J. A., Berat, C., Bertaina, M. E., Bertou, X., Biermann, P. L., Billoir, P., Blaess, S. G., Blanco, A., Blanco, M., Bleve, C., Blümer, H., Boháčová, M., Boncioli, D., Bonifazi, C., Borodai, N., Brack, J., Brancus, I., Bridgeman, A., Brogueira, P., Brown, W. C., Buchholz, P., Bueno, A., Buitink, S., Buscemi, Mario, Caballero Mora, K. S., Caccianiga, B., Caccianiga, L., Candusso, M., Caramete, L., Caruso, R., Castellina, A., Cataldi, G., Cazon, L., Cester, R., Chavez, A. G., Chiavassa, A., Chinellato, J. A., Chudoba, J., Cilmo, Marco, Clay, R. W., Cocciolo, G., Colalillo, Roberta, Coleman, A., Collica, L., Coluccia, M. R., Conceição, R., Contreras, F., Cooper, M. J., Cordier, A., Coutu, S., Covault, C. E., Cronin, J., Dallier, R., Daniel, B., Dasso, S., Daumiller, K., Dawson, B. R., De Almeida, R. M., De Jong, S. J., De Mauro, G., De Mello Neto, J. R. T., De Mitri, I., De Oliveira, J., De Souza, V., Del Peral, L., Deligny, O., Dembinski, H., Dhital, N., Di Giulio, C., Di Matteo, A., Diaz, J. C., Díaz Castro, M. L., Diogo, F., Dobrigkeit, C., Docters, W., D'Olivo, J. C., Dorofeev, A., Dorosti Hasankiadeh, Q., Dova, M. T., Ebr, J., Engel, R., Erdmann, M., Erfani, M., Escobar, C. O., Espadanal, J., Etchegoyen, A., Falcke, H., Fang, K., Farrar, G., Fauth, A. C., Fazzini, N., Ferguson, A. P., Fernandes, M., Fick, B., Figueira, J. M., Filevich, A., Filipčič, A., Fox, B. D., Fratu, O., Freire, M. M., Fuchs, B., Fujii, T., García, B., Garcia Pinto, D., Gate, F., Gemmeke, H., Gherghel Lascu, A., Ghia, P. E., Giaccari, U., Giammarchi, M., Giller, M., Głas, D., Glaser, C., Glass, H., Golup, G., Gómez Berisso, M., Gómez Vitale, P. F., González, N., Gookin, B., Gordon, J., Gorgi, A., Gorham, P., Gouffon, P., Griffith, N., Grillo, A. F., Grubb, T. D., Guardincerri, Y., Guarino, Fausto, Guedes, G. P., Hampel, M. R., Hansen, P., Harari, D., Harrison, T. A., Hartmann, S., Harton, J. L., Haungs, A., Hebbeker, T., Heck, D., Heimann, P., Herve, A. E., Hill, G. C., Hojvat, C., Hollon, N., Holt, E., Homola, P., Hörandel, J. R., Horvath, P., Hrabovský, M., Huber, D., Huege, T., Insolia, A., Isar, P. G., Jandt, I., Jansen, S., Jarne, C., Johnsen, J. A., Josebachuili, M., Kääpä, A., Kambeitz, O., Kampert, K. H., Kasper, P., Katkov, I., Kégl, B., Keilhauer, B., Keivani, A., Kemp, E., Kieckhafer, R. M., Klages, H. E., Kleifges, M., Kleinfeller, J., Krause, R., Krohm, N., Krömer, O., Kuempel, D., Kunka, N., Lahurd, D., Latronico, L., Lauer, R., Lauscher, M., Lautridou, P., Le Coz, S., Lebrun, D., Lebrun, P., Leigui De Oliveira, M. A., Letessier Selvon, A., Lhenry Yvon, I., Link, K., Lopes, L., López, R., López Casado, A., Louedec, K., Lu, L., Lucero, A., Malacari, M., Maldera, S., Mallamaci, M., Maller, J., Mandat, D., Mantsch, P., Mariazzi, A. G., Marin, V., Mariş, I. C., Marsella, G., Martello, D., Martin, L., Martinez, H., Martínez Bravo, O., Martraire, D., Masías Meza, J. J., Mathes, H. J., Mathys, S., Matthews, J., Matthews, J. A. J., Matthiae, G., Maurel, D., Maurizio, D., Mayotte, E., Mazur, P. O., Medina, C., Medina Tanco, G., Meissner, R., Mello, V. B. B., Melo, D., Menshikov, A., Messina, S., Meyhandan, R., Micheletti, M. I., Middendorf, L., Minaya, I. A., Miramonti, L., Mitrica, B., Molina Bueno, L., Mollerach, S., Montanet, F., Morello, C., Mostafá, M., Moura, C. E., Muller, M. A., Müller, G., Müller, S., Mussa, R., Navarra, G., Navarro, J. L., Navas, S., Necesal, P., Nellen, L., Nelles, A., Neuser, J., Nguyen, P. H., Niculescu Oglinzanu, M., Niechciol, M., Niemietz, L., Niggemann, T., Nitz, D., Nosek, D., Novotny, V., Nožka, L., Ochilo, L., Oikonomou, F., Olinto, A., Pacheco, N., Pakk Selmi Dei, D., Palatka, M., Pallotta, J., Papenbreer, P., Parente, G., Parra, A., Paul, T., Pech, M., Pekala, J., Pelayo, R., Pepe, I. M., Perrone, L., Petermann, E., Peters, C., Petrera, S., Petrov, Y., Phuntsok, J., Piegaia, R., Pierog, T., Pieroni, P., Pimenta, M., Pirronello, V., Platino, M., Plum, M., Porcelli, A., Porowski, C., Prado, R. R., Privitera, P., Prouza, M., Purrello, V., Quel, E. J., Querchfeld, S., Quinn, S., Rautenberg, J., Ravel, O., Ravignani, D., Revenu, B., Ridky, J., Riggi, S., Risse, M., Ristori, P., Rizi, V., Rodrigues De Carvalho, W., Rodriguez Fernandez, G., Rodriguez Rojo, J., Rodríguez Frías, M. D., Rogozin, D., Rosado, J., Roth, M., Roulet, E., Rovero, A. C., Saffi, S. J., Saftoiu, A., Salamida, F., Salazar, H., Saleh, A., Salesa Greus, F., Salina, G., Sánchez, F., Sanchez Lucas, P., Santos, E., Santos, E. M., Sarazin, F., Sarkar, B., Sarmento, R., Sato, R., Scarso, C., Schauer, M., Scherini, V., Schieler, H., Schiffer, P., Schmidt, D., Scholten, O., Schoorlemmer, H., Schovánek, P., Schröder, F. G., Schulz, A., Schulz, J., Schumacher, J., Sciutto, S. J., Segreto, A., Settimo, M., Shadkam, A., Shellard, R. C., Sidelnik, I., Sigl, G., Sima, O., ͆miałkowski, A., Šmída, R., Snow, G. R., Sommers, P., Sorokin, J., Squartini, R., Srivastava, Y. N., Stanca, D., Stanič, S., Stapleton, J., Stasielak, J., Stephan, M., Stutz, A., Suarez, F., Suomijärvi, T., Supanitsky, A. D., Sutherland, M. S., Swain, J., Szadkowski, Z., Taborda, O. A., Tapia, A., Tepe, A., Theodoro, V. M., Tiffenberg, J., Timmermans, C., Todero Peixoto, C. J., Toma, G., Tomankova, L., Tomé, B., Tonachini, A., Torralba Elipe, G., Torres Machado, D., Travnicek, P., Ulrich, R., Unger, M., Urban, M., Valdés Galicia, J. F., Valiño, I., Valore, Laura, Van Aar, G., Van Bodegom, P., Van Den Berg, A. M., Van Velzen, S., Van Vliet, A., Varela, E., Vargas Cárdenas, B., Varner, G., Vasquez, R., Vázquez, J. R., Vázquez, R. A., Veberič, D., Verzi, V., Vicha, J., Videla, M., Villaseñor, L., Vlcek, B., Vorobiov, S., Wahlberg, H., Wainberg, O., Walz, D., Watson, A. A., Weber, M., Weidenhaupt, K., Weindl, A., Werner, F., Widom, A., Wiencke, L., Wilczyński, H., Winchen, T., Wittkowski, D., Wundheiler, B., Wykes, S., Yang, L., Yapici, T., Yushkov, A., Zas, E., Zavrtanik, D., Zavrtanik, M., Zepeda, A., Zhu, Y., Zimmermann, B., Ziolkowski, M., Zuccarello, F., Physics, Elementary Particle Physics, UNIVERSIDADE DE ESTADUAL DE CAMPINAS, Research unit Astroparticle Physics, Ahn, E. . J., Albuquerque, I. . F. . M., Aranda, V. . M., Badescu, A. . M., Barber, K. . B., Beatty, J. . J., Becker, K. . H., Bellido, J. . A., Bertaina, M. . E., Biermann, P. . L., Blaess, S. . G., Bleve, Carla, Brown, W. . C., Buscemi, M., Caballero Mora, K. . S., Chavez, A. . G., Chinellato, J. . A., Cilmo, M., Clay, R. . W., Colalillo, R., Coluccia, MARIA RITA, Cooper, M. . J., Covault, C. . E., Dawson, B. . R., de Almeida, R. . M., de Jong, S. . J., de Mello Neto, J. . R. . T., DE MITRI, Ivan, de Oliveira, J., de Souza, V., del Peral, L., Diaz, J. . C., Díaz Castro, M. . L., D’Olivo, J. . C., Dova, M. . T., Escobar, C. . O., Fauth, A. . C., Ferguson, A. . P., Figueira, J. . M., Fox, B. . D., Freire, M. . M., Ghia, P. . L., Gómez Vitale, P. . F., Grillo, A. . F., Grubb, T. . D., Guarino, F., Guedes, G. . P., Hampel, M. . R., Harrison, T. . A., Harton, J. . L., Herve, A. . E., Hill, G. . C., Hörandel, J. . R., Isar, P. . G., Johnsen, J. . A., Kampert, K. . H., Kieckhafer, R. . M., Klages, H. . O., Leigui de Oliveira, M. . A., Mariazzi, A. . G., Mariş, I. . C., Marsella, Giovanni, Martello, Daniele, Masías Meza, J. . J., Mathes, H. . J., Matthews, J. . A. . J., Mazur, P. . O., Mello, V. . B. . B., Micheletti, M. . I., Minaya, I. . A., Moura, C. . A., Muller, M. . A., Navarro, J. . L., Nguyen, P. . H., Pȩkala, J., Pepe, I. . M., Perrone, Lorenzo, Prado, R. . R., Quel, E. . J., Rodrigues de Carvalho, W., Rodríguez Frías, M. . D., Rovero, A. . C., Saffi, S. . J., Santos, E. . M., Scherini, Viviana, Schröder, F. . G., Sciutto, S. . J., Shellard, R. . C., Śmiałkowski, A., Snow, G. . R., Srivastava, Y. . N., Supanitsky, A. . D., Sutherland, M. . S., Taborda, O. . A., Theodoro, V. . M., Todero Peixoto, C. . J., Valdés Galicia, J. . F., Valore, L., van Aar, G., van Bodegom, P., van den Berg, A. . M., van Velzen, S., van Vliet, A., Vázquez, J. . R., Vázquez, R. . A., Watson, A. . A., Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Radboud university [Nijmegen]-Radboud university [Nijmegen], Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO), Institut des Nanosciences de Paris (INSP), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratory for Integrated Micro Mechatronics Systems (LIMMS), Centre National de la Recherche Scientifique (CNRS)-The University of Tokyo (UTokyo), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), Association des services de santé au travail de la Vienne (ASSTV), Immunologie et chimie thérapeutiques (ICT), Cancéropôle du Grand Est-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Propriétés Optiques des Matériaux et Applications (POMA), Centre National de la Recherche Scientifique (CNRS)-Université d'Angers (UA), Colorado School of Mines, Radboud university [Nijmegen], Université Pierre et Marie Curie - Paris 6 (UPMC)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), A. A. Noyes Laboratory of Chemical Physics, and California Institute of Technology (CALTECH)

Subjects
Physics::Instrumentation and Detectors, Astronomy, Solar neutrino, OBSERVATORY, Ciencias Físicas, 01 natural sciences, 7. Clean energy, Ultra-high-energy cosmic rays and neutrinos, high-energy showers, ground detector arrays, Pierre Auger Observatory, Settore FIS/04 - Fisica Nucleare e Subnucleare, purl.org/becyt/ford/1 [https], ENERGY, Neutrino, muon, pion, and other elementary particle detectors, cosmic ray detectors, HIGH, Cosmic-rays, DIFFUSE, ComputingMilieux_MISCELLANEOUS, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, [PHYS]Physics [physics], Neutrino, muon, pion, and other elementary particles, cosmic rays, Settore FIS/01 - Fisica Sperimentale, IMPROVED, Physique atomique et nucléaire, Cosmic neutrino background, NEUTRINOS, ComputingMethodologies_DOCUMENTANDTEXTPROCESSING, Measurements of neutrino speed, Física nuclear, Neutrino, Astrophysics - High Energy Astrophysical Phenomena, physics, AUGER, CIENCIAS NATURALES Y EXACTAS, FLUX, Nuclear and High Energy Physics, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Cosmic ray, Neutrino muon pion and other elementary particles, LIMIT, Nuclear physics, Settore FIS/05 - Astronomia e Astrofisica, Spectrum, 0103 physical sciences, ddc:530, 010306 general physics, ULTRA, Cosmic rays, Zenith, Pierre Auger Observatory, PIERRE, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Array, Física, Detector, purl.org/becyt/ford/1.3 [https], ASTROFÍSICA, Solar neutrino problem, Nuclei, Astronomía, Neutrino muon pion and other elementary particle detectors, Experimental High Energy Physics, High Energy Physics::Experiment, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

Neutrinos in the cosmic ray flux with energies near 1 EeV and above are detectable with the Surface Detector array (SD) of the Pierre Auger Observatory. We report here on searches through Auger data from 1 January 2004 until 20 June 2013. No neutrino candidates were found, yielding a limit to the diffuse flux of ultrahigh energy neutrinos that challenges the Waxman-Bahcall bound predictions. Neutrino identification is attempted using the broad time structure of the signals expected in the SD stations, and is efficiently done for neutrinos of all flavors interacting in the atmosphere at large zenith angles, as well as for "Earth-skimming" neutrino interactions in the case of tau neutrinos. In this paper the searches for downward-going neutrinos in the zenith angle bins 60°-75°and 75°-90°as well as for upward-going neutrinos, are combined to give a single limit. The 90% C.L. single-flavor limit to the diffuse flux of ultrahigh energy neutrinos with an E⁻² spectrum in the energy range 1.0 × 10¹⁷ eV-2.5 × 10¹⁹ eV is E²νdNν/dEν < 6.4 × 10⁻⁹ GeVcm⁻² s⁻¹ sr⁻¹., La lista completa de autores que integran el documento puede consultarse en el archivo., Facultad de Ciencias Exactas, Instituto de Física La Plata

Published
2015

5. The Pierre Auger Observatory - a new stage in the study of the ultra-high energy cosmic rays

Author

Vorobiov, Serguei, The Pierre Auger Collaboration, For, Laboratory for astroparticle physics (LAP-UNG), Laboratory for astroparticle physics, Pierre Auger Observatory (PAO), and Pierre Auger Collaboration

Subjects
[PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], Ultra-high-energy cosmic rays, Astrophysics::High Energy Astrophysical Phenomena, [SDU.ASTR.HE]Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], Astrophysics::Instrumentation and Methods for Astrophysics, Pierre Auger Observatory, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Extensive atmospheric showers, Astrophysics
Abstract

13 pages, 5 figures. Proceedings of the 15th International Seminar QUARKS-2008 on High-Energy Physics in Sergiev Posad, Russia, 23-29 May, 2008; International audience; This paper presents the highlights from the recent measurements of the energy spectrum, mass composition, and arrival directions of the ultra-high energy ($> 10^{17}$ eV = 0.1 EeV) cosmic rays (UHECR) by the Pierre Auger Observatory. The Auger hybrid detector combines fluorescence observations of the longitudinal profiles of extended air showers, initiated by these extremely energetic particles, with measures of the shower secondaries at the ground level by its large array of Cherenkov water tanks. The complementariness of the two techniques provides important cross-checks at the energies unreachable with accelerator experiments. The Pierre Auger experiment has observed a strong steepening of the cosmic ray flux above 40 EeV. A significant anisotropy in the arrival directions of cosmic rays has been established for events above $\simeq 60$ EeV. These events correlate over angular scales of less than 6$^\circ$ with the directions towards nearby ($D < 100$ Mpc) active galactic nuclei. Both observations are consistent with the standard scenarios of the UHECR production in the extragalactic astrophysical acceleration sites. The derived stringent upper limits on the photon and neutrino contents in the UHECR are additional important arguments in support of these scenarios. The measurements of the variation of the depth of shower maximum with energy, interpreted with the current hadronic interaction models, favour the mixed cosmic ray composition at energies above 0.4 EeV. We describe the plans and prospects for the future, that will further help to solve the 50 years old UHECR puzzle.

Published
2008

8. The physical and chemical structure of Sagittarius B2. II. Continuum millimeter emission of SgrB2(M) and SgrB2(N) with ALMA

Author

Álvaro Sánchez-Monge, S.-L. Qin, Adam Ginsburg, A. Schmiedeke, H.S.P. Mueller, D. C. Lis, T. Moeller, Riccardo Cesaroni, E. A. Bergin, Peter Schilke, C. Comito, Physikalisches Institut, Universität zu Köln, National Radio Astronomy Observatory, Socorro (NRAO), INAF-Osservatorio Astrofisico di Arcetri (INAF-OAA), Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Dynamique des milieux interstellaires et plasmas stellaires, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres (LERMA), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY), California Institute of Technology, Pasadena, CA, 91125, USA, Department of Astronomy, Yunnan University, and Key Laboratory of Astroparticle Physics of Yunnan Province, 650091, Kumming, PR China, and Department of Astronomy, University of Michigan, 500 Church Street, Ann Arbor, MI, 48109-1042, USA

Subjects
Continuum (design consultancy), FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, 7. Clean energy, Atmospheric radiative transfer codes, 0103 physical sciences, Cluster (physics), Sagittarius B2, 010303 astronomy & astrophysics, ISM: individual objects: SgrB2(N), Astrophysics::Galaxy Astrophysics, Physics, radio lines: ISM, stars: formation, 010308 nuclear & particles physics, Astronomy and Astrophysics, Astrophysics - Astrophysics of Galaxies, stars: massive, Wavelength, Star cluster, radio continuum: ISM, 13. Climate action, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), Millimeter, ISM: individual objects: SgrB2(M), [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Order of magnitude
Abstract

The high-mass star forming sites SgrB2(M) and SgrB2(N) have been the target of numerous studies, revealing e.g. a rich chemistry. We want to characterize their physical and chemical structure using ALMA high-angular resolution observations at mm wavelengths, reaching spatial scales of about 4000 au, and covering the whole band 6 (from 211 to 275 GHz). In order to determine the continuum emission in line-rich sources, we use a new statistical method: STATCONT. We detect 27 continuum sources in SgrB2(M) and 20 in SgrB2(N). We study the continuum emission across the ALMA band 6, and compare it with previous SMA 345 GHz and VLA 40 GHz observations, to study the nature of the sources detected. The brightest sources are dominated by (partially optically thick) dust emission, while there is an important degree of contamination from ionized gas free-free emission in weaker sources. While the total mass in SgrB2(M) is distributed in many fragments, most of the mass in SgrB2(N) arises from a single object, with filamentary-like structures converging towards the center. There seems to be a lack of low-mass dense cores in both regions. We determine H2 volume densities for the cores of about 10^5-10^7 Msun pc^-3, one to two orders of magnitude higher than the stellar densities of super star clusters. In general, SgrB2(N) is chemically richer than SgrB2(M). There seems to be a correlation between the chemical richness and the mass of the fragments, with more massive clumps being more chemically rich. Both SgrB2(N) and SgrB2(M) harbour a cluster of hot molecular cores. We compare the continuum images with predictions from a detailed 3D radiative transfer model that reproduces the structure of SgrB2 from 45 pc down to 100 au. This dataset, together with ongoing projects in the range 5 to 200 GHz, better constrain the 3D structure of SgrB2, and allow us to understand its physical and chemical structure., Accepted for publication in Astronomy & Astrophysics. 20 pages with 13 figures and 4 tables, plus Appendices with extra figures and tables. (Abstract modified)

Published
2017

9. Upper limit on the cosmic-ray photon flux above 1019 eV using the surface detector of the Pierre Auger Observatory

Author

Abraham, J., Abreu, P., Aglietta, M., Aguirre, C., Allard, D., Allekotte, I., Allen, J., Allison, P., Alvarez Muniz, J., Ambrosio, M., Anchordoqui, L., Andringa, S., Anzalone, A., Aramo, C., Argiro', Stefano, Arisaka, K., Armengaud, E., Arneodo, F., Arqueros, F., Asch, T., Asorey, H., Assis, P., Atulugama, B. S., Aublin, J., Ave, M., Avila, G., Baecker, T., Badagnani, D., Barbosa, A. F., Barnhill, D., Barroso, S. L. C., Bauleo, P., Beatty, J. J., Beau, T., Becker, B. R., Becker, K. H., Bellido, J. A., Benzvi, S., Berat, C., Bergmann, T., Bernardini, P., Bertou, X., Biermann, P. L., Billoir, P., Blanch Bigas, O., Blanco, F., Blasi, P., Bleve, C., Biuemer, H., Bohacova, M., Bonifazi, C., Bonino, Raffaella, Boratav, M., Brack, J., Brogueira, P., Brown, W. C., Buchholz, P., Bueno, A., Burton, R. E., Busca, N. G., Caballero Mora, K. S., Cai, B., Camin, D. V., Caramete, L., Caruso, R., Carvalho, W., Castellina, A., Catalano, O., Cataldi, G., Cazon, L., Cester, Rosanna, Chauvin, J., Chiavassa, Andrea, Chinellato, J. A., Chou, A., Chye, J., Clark, P. D. J., Clay, R. W., Colombo, E., Conceicao, R., Connolly, B., Contreras, F., Coppens, J., Cordier, A., Cotti, U., Coutu, S., Covault, C. E., Creusot, A., Criss, A., Cronin, J., Curutiu, A., Dagoret Campagne, S., Daumiller, K., Dawson, B. R., de Almeida, R. M., Donato, C. D., de Jong, S. J., La Vega, G. D., de Mello, W. J. M., J. r., de Mello Neto, J. R. T., Mitri, I. D., Souza, V. d., Peral, L. d., Deligny, O., Selva, A. D., Fratte, C. D., Dembinski, H., Giulio, C. D., Diaz, J. C., Dobrgkeit, C., D'Olivo, J. C., Dornic, D., Dorofeev, A., dos Anjos, J. C., Dova, M. T., D'Urso, D., Dutan, I., Duvernois, M. A., Engel, R., Epele, L., Erdmann, M., Escobar, C. O., Etchegoyen, A., San Luis, P. F., Falcke, H., Farrar, G., Fauth, A. C., Fazzini, N., Ferrer, F., Ferry, S., Fick, B., Filevich, A., Fllipicic, A., Fleck, I., Fonte, R., Fracchiolla, C. E., Fulgione, W., Garcia, B., Gamez, D. G., Garcia Pinto, D., Garrido, X., Geenen, H., Gelmini, G., Gemmeke, H., Ghia, P. L., Giller, M., Glass, H., Gold, M. S., Golup, G., Albarracin, F. G., Berisso, M. G., Herrero, R. G., Gonqalves, P., do Amaral, M. G., Gonzalez, D., Gonzalez, J. G., Gonzalez, M., Gora, D., Gorgi, Alessio, Gouffon, P., Grassi, V., Grillo, A. F., Grunfeld, C., Guardincerri, Y., Guarino, F., Guedes, G. P., Gutierrez, J., Hague, J. D., Hamilton, J. C., Hansen, P., Harari, D., Harmsma, S., Harton, J. L., Haungs, A., Hauschildt, T., Healy, M. D., Hebbeker, T., Hebrero, G., Heck, D., Hojvat, C., Holmes, V. C., Homola, P., Hoerandel, J., Horneffer, A., Horvat, M., Hrabovsky, M., Huege, T., Hussain, M., Iarlori, M., Insolia, A., Ionita, F., Italiano, A., Kaducak, M., Kampert, K. H., Karova, T., Kegl, B., Keilhauer, B., Kemp, E., Kieckhafer, R. M., Klages, H. O., Kleifges, M., Kleinfeller, J., Knapik, R., Knapp, J., Koang, D. H., Krieger, A., Kroemer, O., Kuempel, D., Kunka, N., Kusenko, A., Rosa, G. L., Lachaud, C., Lago, B. L., Lebrun, D., Lebrun, P., Lee, J., Leigui de Oliveira, M. A., Letessier Selvon, A., Leuthold, M., Lhenry Yvon, I., Lopez, R., Agueera, A. L., Bahilo, J. L., Garcia, R. L., Maccarone, M. C., Macolino, C., Maldera, S., Mancarella, G., Mancenido, M. E., Mandat, D., Mantsch, P., Mariazzi, A. G., Maris, I. C., Marquez Falcon, H. R., Martello, D., Martinez, J., Bravo, O. M., Mathes, H. J., Matthews, J., Matthews, J. A. J., Matthiae, G., Maurizio, D., Mazur, P. O., Mccauley, T., Mcewen, M., Mcneil, R. R., Medina, M. C., Medina Tanco, G., Meli, A., Melo, D., Menichetti, Ezio, Menschikov, A., Meurer, C., Meyhandan, R., Micheletti, M. I., Miele, G., Miller, W., Mollerach, S., Monasor, M., Ragaigne, D. M., Montanet, F., Morales, B., Morello, C., Moreno, J. C., Morris, C., Mostafa, M., Muller, M. A., Mussa, R., Navarra, G., Navarro, J. L., Navas, S., Necesal, P., Nellen, L., Newman Holmes, C., Newton, D., Thao, N. T., Nierstenhoefer, N., Nitz, D., Nosek, D., Nozka, L., Oehlschlaeger, J., Ohnuki, T., Olinto, A., Olmos Gilbaja, V. M., Ortiz, M., Ortolani, F., Ostapchenko, S., Otero, L., Pacheco, N., Selmi Dei, D. P., Palatka, M., Pallotta, J., Parente, G., Parizot, E., Parlati, S., Pastor, S., Patel, M., Paul, T., Pavlidou, V., Payet, K., Pech, M., Pekala, J., Pelayo, R., Pepe, I. M., Perrone, L., Petrera, S., Petrinca, P., Petrov, Y., Diep, P. N., Dong, P. N., Nhung, P. T., Pichel, A., Piegaia, R., Pierog, T., Pimenta, M., Pinto, T., Pirronello, V., Pisanti, O., Platino, M., Pochon, J., Privitera, P., Prouza, M., Quel, E. J., Rautenberg, J., Redondo, A., Reucroft, S., Revenu, B., Rezende, F. A. S., Ridky, J., Riggi, S., Risse, M., Riviere, C., Rizi, V., Roberts, M., Robledo, C., Rodriguez, G., Rodriguez Frias, M. D., Martino, I. R., Rojo, J. R., Rodriguez Cabo, I., Ros, G., Rosado, I., Roth, M., Roucelle, C., Rouille d'Orfeuil, B., Roulet, E., Rovero, A. C., Salamida, F., Salazar, H., Salina, G., Sanchez, F., Santander, M., Santo, C. E., Santos, E. M., Sarazin, F., Sarkar, S., Sato, R., Scherini, V., Schieler, H., Schmidt, A., Schmidt, F., Schmidt, T., Scholten, O., Schovanek, P., Schuessler, F., Sciutto, S. J., Scudeni, M., Segreto, A., Semikoz, D., Settimo, M., Shellard, R. C., Sidelnik, I., Siffert, B. B., Sigl, G., De Grande, N. S., Smialkowski, A., Smida, R., Smith, A. G. K., Smith, B. E., Snow, G. R., Sokolsky, P., Sommers, P., Sorokin, J., Spinka, H., Squartini, R., Strazzeri, E., Stutz, A., Suarez, F., Suomijaervi, T., Supanitsky, A. D., Sutherland, M. S., Swain, J., Szadkowski, Z., Takahashi, J., Tamashiro, A., Tamburro, A., Tascau, O., Tcaciuc, R., Thomas, D., Ticona, R., Tiffenberg, J., Timmermans, C., Tkaczyk, W., Todero Peixoto, C. J., Tome, B., Tonachini, Aurelio Siro, Torres, I., Torresi, D., Travnicek, P., Tripathi, A., Tristram, G., Tscherniakhovski, D., Tueros, M., Tunnicliffe, V., Ulrich, R., Unger, M., Urban, M., Valdes Galicia, J. F., Valino, I., Valore, L., van den Berg, A. M., Elewyck, V. v., Vazquez, R. A., Veberic, D., Veiga, A., Velarde, A., Venters, T., Verzi, V., Videla, M., Villasenor, L., Vorobiov, S., Voyvodic, L., Wahlberg, H., Wainberg, O., Walker, P., Warner, D., Watson, A. A., Westerhoff, S., Wieczorek, G., Wiencke, L., Wilczynska, B., Wilczynski, H., Wileman, C., Winnick, M. G., Wu, H., Wundheiler, B., Yamamoto, T., Younk, P., Zas, E., Zavrtanik, D., Zavrtanik, M., Zech, A., Zepeda, A., Holkowski, M., APC - Astrophysique des Hautes Energies (APC - AHE), AstroParticule et Cosmologie (APC (UMR_7164)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Dipartimento di Astronomia, Universita degli Studi di Bologna, Università di Bologna [Bologna] (UNIBO)-Università di Bologna [Bologna] (UNIBO), PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), APC - Cosmologie, Physique Corpusculaire et Cosmologie - Collège de France (PCC), Collège de France (CdF)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Collège de France (CdF)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-AstroParticule et Cosmologie (APC (UMR_7164)), PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), APC - THEORIE, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Institut für theoretische Physik, Universität Hamburg (UHH)-Universität Hamburg (UHH), Laboratory for Astroparticle Physics, University of Nova Gorica, PIERRE AUGER, J., Abraham, P., Abreu, M., Aglietta, C., Aguirre, D., Allard, I., Allekotte, J., Allen, P., Allison, J., Alvarez Muniz, M., Ambrosio, L., Anchordoqui, S., Andringa, A., Anzalone, C., Aramo, S., Argiro', K., Arisaka, E., Armengaud, F., Arneodo, F., Arquero, T., Asch, H., Asorey, P., Assi, B. S., Atulugama, J., Aublin, M., Ave, G., Avila, T., Backer, D., Badagnani, A. F., Barbosa, D., Barnhill, S. L. C., Barroso, P., Bauleo, J. J., Beatty, T., Beau, B. R., Becker, K. H., Becker, J. A., Bellido, S., Benzvi, C., Berat, T., Bergmann, Bernardini, Paolo, X., Bertou, P. L., Biermann, P., Billoir, O., Blanch Biga, F., Blanco, P., Blasi, C., Bleve, H., Blumer, M., Bohacova, C., Bonifazi, R., Bonino, M., Boratav, J., Brack, P., Brogueira, W. C., Brown, P., Buchholz, A., Bueno, R. E., Burton, N. G., Busca, K. S., Caballero Mora, B., Cai, D. V., Camin, L., Caramete, R., Caruso, W., Carvalho, A., Castellina, O., Catalano, G., Cataldi, L., Cazon, R., Cester, J., Chauvin, A., Chiavassa, J. A., Chinellato, A., Chou, J., Chye, P. D. J., Clark, R. W., Clay, E., Colombo, R., Conceicao, B., Connolly, F., Contrera, J., Coppen, A., Cordier, U., Cotti, S., Coutu, C. E., Covault, A., Creusot, A., Cri, J., Cronin, A., Curutiu, S., Dagoret Campagne, K., Daumiller, B. R., Dawson, R. M., de Almeida, C., De Donato, S. J., de Jong, G., De La Vega, W. J. M., de Mello Junior, J. R. T., de Mello Neto, DE MITRI, Ivan, V., de Souza, L., del Peral, O., Deligny, A., Della Selva, C., Delle Fratte, H., Dembinski, C., Di Giulio, J. C., Diaz, C., Dobrigkeit, J. C., D’Olivo, D., Dornic, A., Dorofeev, J. C., dos Anjo, M. T., Dova, D., D’Urso, I., Dutan, M. A., Duvernoi, R., Engel, L., Epele, M., Erdmann, C. O., Escobar, A., Etchegoyen, P., Facal San Lui, H., Falcke, G., Farrar, A. C., Fauth, N., Fazzini, F., Ferrer, S., Ferry, B., Fick, A., Filevich, A., Filipcic, I., Fleck, R., Fonte, C. E., Fracchiolla, W., Fulgione, B., Garcia, D., Garcia Gamez, D., Garcia Pinto, X., Garrido, H., Geenen, G., Gelmini, H., Gemmeke, P. L., Ghia, M., Giller, H., Gla, M. S., Gold, G., Golup, F., Gomez Albarracin, M., Gomez Berisso, R., Gomez Herrero, P., Goncalve, M., Goncalves do Amaral, D., Gonzalez, J. G., Gonzalez, M., Gonzalez, D., Gora, A., Gorgi, P., Gouffon, V., Grassi, A. F., Grillo, C., Grunfeld, Y., Guardincerri, F., Guarino, G. P., Guede, J., Gutierrez, J. D., Hague, J. C., Hamilton, P., Hansen, D., Harari, S., Harmsma, J. L., Harton, A., Haung, T., Hauschildt, M. D., Healy, T., Hebbeker, G., Hebrero, D., Heck, C., Hojvat, V. C., Holme, P., Homola, J., Horandel, A., Horneffer, M., Horvat, M., Hrabovsky, T., Huege, M., Hussain, M., Iarlori, A., Insolia, F., Ionita, A., Italiano, M., Kaducak, K. H., Kampert, T., Karova, B., Kegl, B., Keilhauer, E., Kemp, R. M., Kieckhafer, H. O., Klage, M., Kleifge, J., Kleinfeller, R., Knapik, J., Knapp, D. H., Koang, A., Krieger, O., Kromer, D., Kuempel, N., Kunka, A., Kusenko, G., La Rosa, C., Lachaud, B. L., Lago, D., Lebrun, P., Lebrun, J., Lee, M. A., Leigui de Oliveira, A., Letessier Selvon, M., Leuthold, I., Lhenry Yvon, R., Lopez, A., Lopez Aguera, J., Lozano Bahilo, R., Luna Garcia, M. C., Maccarone, C., Macolino, S., Maldera, Mancarella, Giovanni, M. E., Mancenido, D., Mandat, P., Mantsch, A. G., Mariazzi, I. C., Mari, H. R., Marquez Falcon, Martello, Daniele, J., Martinez, O., Martinez Bravo, H. J., Mathe, J., Matthew, J. A. J., Matthew, G., Matthiae, D., Maurizio, P. O., Mazur, T., Mccauley, M., Mcewen, R. R., Mcneil, M. C., Medina, G., Medina Tanco, A., Meli, D., Melo, E., Menichetti, A., Menschikov, Meurer, C. h. r., R., Meyhandan, M. I., Micheletti, G., Miele, W., Miller, S., Mollerach, M., Monasor, D., Monnier Ragaigne, F., Montanet, B., Morale, C., Morello, J. C., Moreno, C., Morri, M., Mostafa, M. A., Muller, R., Mussa, G., Navarra, J. L., Navarro, S., Nava, P., Necesal, L., Nellen, C., Newman Holme, D., Newton, N. T., Thao, N., Nierstenhoefer, D., Nitz, D., Nosek, L., Nozka, J., Oehlschlager, T., Ohnuki, A., Olinto, V. M., Olmos Gilbaja, M., Ortiz, F., Ortolani, S., Ostapchenko, L., Otero, N., Pacheco, D., Pakk Selmi Dei, M., Palatka, J., Pallotta, G., Parente, E., Parizot, S., Parlati, S., Pastor, M., Patel, T., Paul, V., Pavlidou, K., Payet, M., Pech, J., Pekala, R., Pelayo, I. M., Pepe, Perrone, Lorenzo, S., Petrera, P., Petrinca, Y., Petrov, P. N., Diep, P. N., Dong, P. T., Nhung, A., Pichel, R., Piegaia, T., Pierog, M., Pimenta, T., Pinto, V., Pirronello, O., Pisanti, M., Platino, J., Pochon, P., Privitera, M., Prouza, E. J., Quel, J., Rautenberg, A., Redondo, S., Reucroft, B., Revenu, F. A. S., Rezende, J., Ridky, S., Riggi, M., Risse, C., Riviere, V., Rizi, M., Robert, C., Robledo, G., Rodriguez, M. D., Rodriguez Fria, J., Rodriguezmartino, J., Rodriguez Rojo, I., Rodriguez Cabo, G., Ro, J., Rosado, M., Roth, C., Roucelle, B., Rouille' d’Orfeuil, E., Roulet, A. C., Rovero, F., Salamida, H., Salazar, G., Salina, F., Sanchez, M., Santander, C. E., Santo, E. M., Santo, F., Sarazin, S., Sarkar, R., Sato, V., Scherini, H., Schieler, A., Schmidt, F., Schmidt, T., Schmidt, O., Scholten, P., Schovanek, F., Schussler, S. J., Sciutto, M., Scuderi, A., Segreto, D., Semikoz, M., Settimo, R. C., Shellard, I., Sidelnik, B. B., Siffert, G., Sigl, N., Smetniansky De Grande, A., Smialkowski, R., Smida, A. G. K., Smith, B. E., Smith, G. R., Snow, P., Sokolsky, P., Sommer, J., Sorokin, H., Spinka, R., Squartini, E., Strazzeri, A., Stutz, F., Suarez, T., Suomijarvi, A. D., Supanitsky, M. S., Sutherland, J., Swainc, Z., Szadkowski, J., Takahashi, A., Tamashiro, A., Tamburro, O., Tascau, R., Tcaciuc, D., Thoma, R., Ticon, J., Tiffenberg, C., Timmerman, W., Tkaczyk, C. J., Todero Peixoto, B., Tome', A., Tonachini, I., Torre, D., Torresi, P., Travnicek, A., Tripathi, G., Tristram, D., Tscherniakhovski, M., Tuero, V., Tunnicliffe, R., Ulrich, M., Unger, M., Urbana, J. F., Valdes Galicia, I., Valino, L., Valore, A. M., van den Berg, V., van Elewyck, R. A., Vazquez, D., Veberic, A., Veiga, A., Velarde, T., Ventersc, V., Verzi, M., Videl, L., Villasenor, S., Vorobiov, L., Voyvodic, H., Wahlber, O., Wainber, P., Walker, D., Warner, A. A., Watson, S., Westerhoff, G., Wieczorek, L., Wiencke, B., Wilczynska, H., Wilczynski, C., Wileman, M. G., Winnick, H., Wua, B., Wundheiler, T., Yamamoto, P., Younk, E., Zasb, D., Zavrtanik, M., Zavrtanik, A., Zech, A., Zepeda, M., Ziolkowski, Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Dipartimento di Astronomia, Universita degli Studi di Bologna, Alma Mater Studiorum Università di Bologna [Bologna] (UNIBO)-Alma Mater Studiorum Università di Bologna [Bologna] (UNIBO), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut für theoretische Physik, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Alma Mater Studiorum Università di Bologna [Bologna] (UNIBO), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut für theoretische Physik, Guarino, Fausto, D'Urso, Domenico, Aramo, Carla, Miele, Gennaro, Pisanti, Ofelia, and Valore, Laura

Subjects
Photon, [SDU.ASTR.CO]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Astronomy, Flux, FOS: Physical sciences, Osservatorio Pierre Auger, Cosmic ray, Fotones, Astrophysics, 7. Clean energy, 01 natural sciences, Auger, Nuclear physics, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], High Energy Physics - Phenomenology (hep-ph), Raggi cosmici, ultra high energy photons, Cascada atmosférica, Observatory, 0103 physical sciences, 010306 general physics, Ciencias Exactas, Pierre Auger Observatory, Physics, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], 010308 nuclear & particles physics, Astrophysics (astro-ph), Física, Astronomy and Astrophysics, Energia ultra alta, High Energy Physics - Phenomenology, Pair production, 13. Climate action, Fotoni, Experimental High Energy Physics, ddc:540, flux upper limit, Neutrino, Sciami atmosferici estesi
Abstract

A method is developed to search for air showers initiated by photons using data recorded by the surface detector of the Auger Observatory. The approach is based on observables sensitive to the longitudinal shower development, the signal risetime and the curvature of the shower front. Applying this method to the data, upper limits on the flux of photons of 3.8 x 10-3, 2.5 x 10-3; and 2.2 x 10-3 km-2 sr-1 yr-1 above 1019 eV, 2 x 1019 eV; and 4 x 1019 eV are derived, with corresponding limits on the fraction of photons being 2.0%, 5.1%, and 31% (all limits at 95% c.l.). These photon limits disfavor certain exotic models of sources of cosmic rays. The results also show that the approach adopted by the Auger Observatory to calibrate the shower energy is not strongly biased by a contamination from photons., Facultad de Ciencias Exactas

Published
2008

10. Correlation of the highest-energy cosmic rays with nearby extragalactic objects

Author

J. Abraham, P. Abreu, M. Aglietta, C. Aguirre, D. Allard, I. Allekotte, J. Allen, P. Allison, J. Alvarez Muniz, M. Ambrosio, L. Anchordoqui, S. Andringa, A. Anzalone, C. Aramo, S. Argiro', K. Arisaka, E. Armengaud, F. Arneodo, F. Arquero, T. Asch, H. Asorey, P. Assis, B. S. Atulugama, J. Aublin, M. Ave, G. Avila, T. Backer, D. Badagnani, A. F. Barbosa, D. Barnhill, S. L. C. Barroso, P. Bauleo, J. J. Beatty, T. Beau, B. R. Becker, K. H. Becker, J. A. Bellido, S. BenZvi, C. Berat, T. Bergmann, X. Bertou, P. L. Biermann, P. Billoir, O. Blanch Bigas, F. Blanco, P. Blasi, C. Bleve, H. Blumer, M. Bohacova, C. Bonifazi, R. Bonino, M. Boratav, J. Brack, P. Brogueira, W. C. Brown, P. Buchholz, A. Bueno, R. E. Burton, N. G. Busca, K. S. Caballero Mora, B. Cai, D. V. Camin, L. Caramete, R. Caruso, W. Carvalho, A. Castellina, O. Catalano, G. Cataldi, L. Cazon, R. Cester, J. Chauvin, A. Chiavassa, J. A. Chinellato, A. Chou, J. Chye, P. D. J. Clark, R. W. Clay, E. Colombo, R. Conceicao, B. Connolly, F. Contreras, J. Coppens, A. Cordier, U. Cotti, S. Coutu, C. E. Covault, A. Creusot, A. Criss, J. Cronin, A. Curutiu, S. Dagoret Campagne, K. Daumiller, B. R. Dawson, R. M. de Almeida, C. De Donato, S. J. de Jong, G. De La Vega, W. J. M. de Mello Junior, J. R. T. de Mello Neto, V. de Souza, L. del Peral, O. Deligny, A. Della Selva, C. Delle Fratte, H. Dembinski, C. Di Giulio, J. C. Diaz, C. Dobrigkeit, J. C. D’Olivo, D. Dornic, A. Dorofeev, J. C. dos Anjos, M. T. Dova, D. D’Urso, I. Dutan, M. A. DuVernois, R. Engel, L. Epele, M. Erdmann, C. O. Escobar, A. Etchegoyen, P. Facal San Luis, H. Falcke, G. Farrar, A. C. Fauth, N. Fazzini, F. Ferrer, S. Ferry, B. Fick, A. Filevich, A. Filipcic, I. Fleck, R. Fonte, C. E. Fracchiolla, W. Fulgione, B. Garcia, D. Garcia Gamez, D. Garcia Pinto, X. Garrido, H. Geenen, G. Gelmini, H. Gemmeke, P. L. Ghia, M. Giller, H. Glass, M. S. Gold, G. Golup, F. Gomez Albarracin, M. Gomez Berisso, R. Gomez Herrero, P. Goncalves, M. Goncalves do Amaral, D. Gonzalez, J. G. Gonzalez, M. Gonzalez, D. Gora, A. Gorgi, P. Gouffon, V. Grassi, A. F. Grillo, C. Grunfeld, Y. Guardincerri, F. Guarino, G. P. Guedes, J. Gutierrez, J. D. Hague, J. C. Hamilton, P. Hansen, D. Harari, S. Harmsma, J. L. Harton, A. Haungs, T. Hauschildt, M. D. Healy, T. Hebbeker, G. Hebrero, D. Heck, C. Hojvat, V. C. Holmes, P. Homola, J. Horandel, A. Horneffer, M. Horvat, M. Hrabovsky, T. Huege, M. Hussain, M. Iarlori, A. Insolia, F. Ionita, A. Italiano, M. Kaducak, K. H. Kampert, T. Karova, B. Kegl, B. Keilhauer, E. Kemp, R. M. Kieckhafer, H. O. Klages, M. Kleifges, J. Kleinfeller, R. Knapik, J. Knapp, D. H. Koang, A. Krieger, O. Kromer, D. Kuempel, N. Kunka, A. Kusenko, G. La Rosa, C. Lachaud, B. L. Lago, D. Lebrun, P. Lebrun, J. Lee, M. A. Leigui de Oliveira, A. Letessier Selvon, M. Leuthold, I. Lhenry Yvon, R. Lopez, A. Lopez Aguera, J. Lozano Bahilo, R. Luna Garcia, M. C. Maccarone, C. Macolino, S. Maldera, M. E. Mancenido, D. Mandat, P. Mantsch, A. G. Mariazzi, I. C. Maris, H. R. Marquez Falcon, J. Martinez, O. Martinez Bravo, H. J. Mathes, J. Matthews, J. A. J. Matthews, G. Matthiae, D. Maurizio, P. O. Mazur, T. McCauley, M. McEwen, R. R. McNeil, M. C. Medina, G. Medina Tanco, A. Meli, D. Melo, E. Menichetti, A. Menschikov, C.h.r. Meurer, R. Meyhandan, M. I. Micheletti, G. Miele, W. Miller, S. Mollerach, M. Monasor, D. Monnier Ragaigne, F. Montanet, B. Morales, C. Morello, J. C. Moreno, C. Morris, M. Mostafa, M. A. Muller, R. Mussa, G. Navarra, J. L. Navarro, S. Navas, P. Necesal, L. Nellen, C. Newman Holmes, D. Newton, N. T. Thao, N. Nierstenhoefer, D. Nitz, D. Nosek, L. Nozka, J. Oehlschlager, T. Ohnuki, A. Olinto, V. M. Olmos Gilbaja, M. Ortiz, F. Ortolani, S. Ostapchenko, L. Otero, N. Pacheco, D. Pakk Selmi Dei, M. Palatka, J. Pallotta, G. Parente, E. Parizot, S. Parlati, S. Pastor, M. Patel, T. Paul, V. Pavlidou, K. Payet, M. Pech, J. Pekala, R. Pelayo, I. M. Pepe, S. Petrera, P. Petrinca, Y. Petrov, P. N. Diep, P. N. Dong, P. T. Nhung, A. Pichel, R. Piegaia, T. Pierog, M. Pimenta, T. Pinto, V. Pirronello, O. Pisanti, M. Platino, J. Pochon, P. Privitera, M. Prouza, E. J. Quel, J. Rautenberg, A. Redondo, S. Reucroft, B. Revenu, F. A. S. Rezende, J. Ridky, S. Riggi, M. Risse, C. Riviere, V. Rizi, M. Roberts, C. Robledo, G. Rodriguez, M. D. Rodriguez Frias, J. RodriguezMartino, J. Rodriguez Rojo, I. Rodriguez Cabo, G. Ros, J. Rosado, M. Roth, C. Roucelle, B. Rouille' d’Orfeuil, E. Roulet, A. C. Rovero, F. Salamida, H. Salazar, G. Salina, F. Sanchez, M. Santander, C. E. Santo, E. M. Santos, F. Sarazin, S. Sarkar, R. Sato, V. Scherini, H. Schieler, A. Schmidt, F. Schmidt, T. Schmidt, O. Scholten, P. Schovanek, F. Schussler, S. J. Sciutto, M. Scuderi, A. Segreto, D. Semikoz, M. Settimo, R. C. Shellard, I. Sidelnik, B. B. Siffert, G. Sigl, N. Smetniansky De Grande, A. Smialkowski, R. Smida, A. G. K. Smith, B. E. Smith, G. R. Snow, P. Sokolsky, P. Sommers, J. Sorokin, H. Spinka, R. Squartini, E. Strazzeri, A. Stutz, F. Suarez, T. Suomijarvi, A. D. Supanitsky, M. S. Sutherland, J. Swainc, Z. Szadkowski, J. Takahashi, A. Tamashiro, A. Tamburro, O. Tascau, R. Tcaciuc, D. Thomas, R. Ticon, J. Tiffenberg, C. Timmermans, W. Tkaczyk, C. J. Todero Peixoto, B. Tome', A. Tonachini, I. Torres, D. Torresi, P. Travnicek, A. Tripathi, G. Tristram, D. Tscherniakhovski, M. Tueros, V. Tunnicliffe, R. Ulrich, M. Unger, M. Urbana, J. F. Valdes Galicia, I. Valino, L. Valore, A. M. van den Berg, V. van Elewyck, R. A. Vazquez, D. Veberic, A. Veiga, A. Velarde, T. Ventersc, V. Verzi, M. Videl, L. Villasenor, S. Vorobiov, L. Voyvodic, H. Wahlber, O. Wainber, P. Walker, D. Warner, A. A. Watson, S. Westerhoff, G. Wieczorek, L. Wiencke, B. Wilczynska, H. Wilczynski, C. Wileman, M. G. Winnick, H. Wua, B. Wundheiler, T. Yamamoto, P. Younk, E. Zasb, D. Zavrtanik, M. Zavrtanik, A. Zech, A. Zepeda, M. Ziolkowski, BERNARDINI, Paolo, DE MITRI, Ivan, MANCARELLA, Giovanni, MARTELLO, Daniele, PERRONE, Lorenzo, J., Abraham, P., Abreu, M., Aglietta, C., Aguirre, D., Allard, I., Allekotte, J., Allen, P., Allison, J., Alvarez Muniz, M., Ambrosio, L., Anchordoqui, S., Andringa, A., Anzalone, C., Aramo, S., Argiro', K., Arisaka, E., Armengaud, F., Arneodo, F., Arquero, T., Asch, H., Asorey, P., Assi, B. S., Atulugama, J., Aublin, M., Ave, G., Avila, T., Backer, D., Badagnani, A. F., Barbosa, D., Barnhill, S. L. C., Barroso, P., Bauleo, J. J., Beatty, T., Beau, B. R., Becker, K. H., Becker, J. A., Bellido, S., Benzvi, C., Berat, T., Bergmann, Bernardini, Paolo, X., Bertou, P. L., Biermann, P., Billoir, O., Blanch Biga, F., Blanco, P., Blasi, C., Bleve, H., Blumer, M., Bohacova, C., Bonifazi, R., Bonino, M., Boratav, J., Brack, P., Brogueira, W. C., Brown, P., Buchholz, A., Bueno, R. E., Burton, N. G., Busca, K. S., Caballero Mora, B., Cai, D. V., Camin, L., Caramete, R., Caruso, W., Carvalho, A., Castellina, O., Catalano, G., Cataldi, L., Cazon, R., Cester, J., Chauvin, A., Chiavassa, J. A., Chinellato, A., Chou, J., Chye, P. D. J., Clark, R. W., Clay, E., Colombo, R., Conceicao, B., Connolly, F., Contrera, J., Coppen, A., Cordier, U., Cotti, S., Coutu, C. E., Covault, A., Creusot, A., Cri, J., Cronin, A., Curutiu, S., Dagoret Campagne, K., Daumiller, B. R., Dawson, R. M., de Almeida, C., De Donato, S. J., de Jong, G., De La Vega, W. J. M., de Mello Junior, J. R. T., de Mello Neto, DE MITRI, Ivan, V., de Souza, L., del Peral, O., Deligny, A., Della Selva, C., Delle Fratte, H., Dembinski, C., Di Giulio, J. C., Diaz, C., Dobrigkeit, J. C., D’Olivo, D., Dornic, A., Dorofeev, J. C., dos Anjo, M. T., Dova, D., D’Urso, I., Dutan, M. A., Duvernoi, R., Engel, L., Epele, M., Erdmann, C. O., Escobar, A., Etchegoyen, P., Facal San Lui, H., Falcke, G., Farrar, A. C., Fauth, N., Fazzini, F., Ferrer, S., Ferry, B., Fick, A., Filevich, A., Filipcic, I., Fleck, R., Fonte, C. E., Fracchiolla, W., Fulgione, B., Garcia, D., Garcia Gamez, D., Garcia Pinto, X., Garrido, H., Geenen, G., Gelmini, H., Gemmeke, P. L., Ghia, M., Giller, H., Gla, M. S., Gold, G., Golup, F., Gomez Albarracin, M., Gomez Berisso, R., Gomez Herrero, P., Goncalve, M., Goncalves do Amaral, D., Gonzalez, J. G., Gonzalez, M., Gonzalez, D., Gora, A., Gorgi, P., Gouffon, V., Grassi, A. F., Grillo, C., Grunfeld, Y., Guardincerri, F., Guarino, G. P., Guede, J., Gutierrez, J. D., Hague, J. C., Hamilton, P., Hansen, D., Harari, S., Harmsma, J. L., Harton, A., Haung, T., Hauschildt, M. D., Healy, T., Hebbeker, G., Hebrero, D., Heck, C., Hojvat, V. C., Holme, P., Homola, J., Horandel, A., Horneffer, M., Horvat, M., Hrabovsky, T., Huege, M., Hussain, M., Iarlori, A., Insolia, F., Ionita, A., Italiano, M., Kaducak, K. H., Kampert, T., Karova, B., Kegl, B., Keilhauer, E., Kemp, R. M., Kieckhafer, H. O., Klage, M., Kleifge, J., Kleinfeller, R., Knapik, J., Knapp, D. H., Koang, A., Krieger, O., Kromer, D., Kuempel, N., Kunka, A., Kusenko, G., La Rosa, C., Lachaud, B. L., Lago, D., Lebrun, P., Lebrun, J., Lee, M. A., Leigui de Oliveira, A., Letessier Selvon, M., Leuthold, I., Lhenry Yvon, R., Lopez, A., Lopez Aguera, J., Lozano Bahilo, R., Luna Garcia, M. C., Maccarone, C., Macolino, S., Maldera, Mancarella, Giovanni, M. E., Mancenido, D., Mandat, P., Mantsch, A. G., Mariazzi, I. C., Mari, H. R., Marquez Falcon, Martello, Daniele, J., Martinez, O., Martinez Bravo, H. J., Mathe, J., Matthew, J. A. J., Matthew, G., Matthiae, D., Maurizio, P. O., Mazur, T., Mccauley, M., Mcewen, R. R., Mcneil, M. C., Medina, G., Medina Tanco, A., Meli, D., Melo, E., Menichetti, A., Menschikov, Meurer, C. h. r., R., Meyhandan, M. I., Micheletti, G., Miele, W., Miller, S., Mollerach, M., Monasor, D., Monnier Ragaigne, F., Montanet, B., Morale, C., Morello, J. C., Moreno, C., Morri, M., Mostafa, M. A., Muller, R., Mussa, G., Navarra, J. L., Navarro, S., Nava, P., Necesal, L., Nellen, C., Newman Holme, D., Newton, N. T., Thao, N., Nierstenhoefer, D., Nitz, D., Nosek, L., Nozka, J., Oehlschlager, T., Ohnuki, A., Olinto, V. M., Olmos Gilbaja, M., Ortiz, F., Ortolani, S., Ostapchenko, L., Otero, N., Pacheco, D., Pakk Selmi Dei, M., Palatka, J., Pallotta, G., Parente, E., Parizot, S., Parlati, S., Pastor, M., Patel, T., Paul, V., Pavlidou, K., Payet, M., Pech, J., Pekala, R., Pelayo, I. M., Pepe, Perrone, Lorenzo, S., Petrera, P., Petrinca, Y., Petrov, P. N., Diep, P. N., Dong, P. T., Nhung, A., Pichel, R., Piegaia, T., Pierog, M., Pimenta, T., Pinto, V., Pirronello, O., Pisanti, M., Platino, J., Pochon, P., Privitera, M., Prouza, E. J., Quel, J., Rautenberg, A., Redondo, S., Reucroft, B., Revenu, F. A. S., Rezende, J., Ridky, S., Riggi, M., Risse, C., Riviere, V., Rizi, M., Robert, C., Robledo, G., Rodriguez, M. D., Rodriguez Fria, J., Rodriguezmartino, J., Rodriguez Rojo, I., Rodriguez Cabo, G., Ro, J., Rosado, M., Roth, C., Roucelle, B., Rouille' d’Orfeuil, E., Roulet, A. C., Rovero, F., Salamida, H., Salazar, G., Salina, F., Sanchez, M., Santander, C. E., Santo, E. M., Santo, F., Sarazin, S., Sarkar, R., Sato, V., Scherini, H., Schieler, A., Schmidt, F., Schmidt, T., Schmidt, O., Scholten, P., Schovanek, F., Schussler, S. J., Sciutto, M., Scuderi, A., Segreto, D., Semikoz, M., Settimo, R. C., Shellard, I., Sidelnik, B. B., Siffert, G., Sigl, N., Smetniansky De Grande, A., Smialkowski, R., Smida, A. G. K., Smith, B. E., Smith, G. R., Snow, P., Sokolsky, P., Sommer, J., Sorokin, H., Spinka, R., Squartini, E., Strazzeri, A., Stutz, F., Suarez, T., Suomijarvi, A. D., Supanitsky, M. S., Sutherland, J., Swainc, Z., Szadkowski, J., Takahashi, A., Tamashiro, A., Tamburro, O., Tascau, R., Tcaciuc, D., Thoma, R., Ticon, J., Tiffenberg, C., Timmerman, W., Tkaczyk, C. J., Todero Peixoto, B., Tome', A., Tonachini, I., Torre, D., Torresi, P., Travnicek, A., Tripathi, G., Tristram, D., Tscherniakhovski, M., Tuero, V., Tunnicliffe, R., Ulrich, M., Unger, M., Urbana, J. F., Valdes Galicia, I., Valino, L., Valore, A. M., van den Berg, V., van Elewyck, R. A., Vazquez, D., Veberic, A., Veiga, A., Velarde, T., Ventersc, V., Verzi, M., Videl, L., Villasenor, S., Vorobiov, L., Voyvodic, H., Wahlber, O., Wainber, P., Walker, D., Warner, A. A., Watson, S., Westerhoff, G., Wieczorek, L., Wiencke, B., Wilczynska, H., Wilczynski, C., Wileman, M. G., Winnick, H., Wua, B., Wundheiler, T., Yamamoto, P., Younk, E., Zasb, D., Zavrtanik, M., Zavrtanik, A., Zech, A., Zepeda, M., Ziolkowski, APC - Astrophysique des Hautes Energies (APC - AHE), AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Alma Mater Studiorum Università di Bologna [Bologna] (UNIBO), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), APC - Cosmologie, APC - THEORIE, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut für theoretische Physik, Universität Hamburg (UHH)-Universität Hamburg (UHH), Laboratory for Astroparticle Physics, University of Nova Gorica, PIERRE AUGER, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Dipartimento di Astronomia, Universita degli Studi di Bologna, Università di Bologna [Bologna] (UNIBO)-Università di Bologna [Bologna] (UNIBO), PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Physique Corpusculaire et Cosmologie - Collège de France (PCC), Collège de France (CdF)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Collège de France (CdF)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-AstroParticule et Cosmologie (APC (UMR_7164)), PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Institut für theoretische Physik, Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Dipartimento di Astronomia, Universita degli Studi di Bologna, Alma Mater Studiorum Università di Bologna [Bologna] (UNIBO)-Alma Mater Studiorum Università di Bologna [Bologna] (UNIBO), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut für theoretische Physik, Guarino, Fausto, D'Urso, Domenico, Aramo, Carla, DELLA SELVA, Angelo, Miele, Gennaro, Pisanti, Ofelia, Valore, Laura, Auger, Collaboration, KVI - Center for Advanced Radiation Technology, and Research unit Astroparticle Physics

Subjects
Active galactic nucleus, [SDU.ASTR.CO]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Astronomy, Astrophysics::High Energy Astrophysical Phenomena, particle source [cosmic radiation], Cosmic background radiation, FOS: Physical sciences, Flux, Osservatorio Pierre Auger, Cosmic ray, anisotropy, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Raggi cosmici, 0103 physical sciences, Ultra-high-energy cosmic ray, 010303 astronomy & astrophysics, Background radiation, Nuclei galattivi attivi, Physics, Pierre Auger Observatory, SPECTRUM, Multidisciplinary, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], 010308 nuclear & particles physics, Medicine (all), Settore FIS/01 - Fisica Sperimentale, Astrophysics (astro-ph), angular dependence [cosmic radiation], Astrophysics::Instrumentation and Methods for Astrophysics, Física, Energia ultra alta, Experimental High Energy Physics, ddc:500, Energy (signal processing), experimental results
Abstract

Using data collected at the Pierre Auger Observatory during the past 3.7 years, we demonstrated a correlation between the arrival directions of cosmic rays with energy above ~ 6x10^{19} electron volts and the positions of active galactic nuclei (AGN) lying within ~ 75 megaparsecs. We rejected the hypothesis of an isotropic distribution of these cosmic rays with at least a 99% confidence level from a prescribed a priori test. The correlation we observed is compatible with the hypothesis that the highest energy particles originate from nearby extragalactic sources whose flux has not been substantially reduced by interaction with the cosmic background radiation. AGN or objects having a similar spatial distribution are possible sources., Comment: 22 pages, 2 figures

11. Search for Cosmic-Ray Electron and Positron Anisotropies with Seven Years of Fermi Large Area Telescope Data.

Author

Abdollahi S, Ackermann M, Ajello M, Albert A, Atwood WB, Baldini L, Barbiellini G, Bellazzini R, Bissaldi E, Bloom ED, Bonino R, Bottacini E, Brandt TJ, Bruel P, Buson S, Caragiulo M, Cavazzuti E, Chekhtman A, Ciprini S, Costanza F, Cuoco A, Cutini S, D'Ammando F, de Palma F, Desiante R, Digel SW, Di Lalla N, Di Mauro M, Di Venere L, Donaggio B, Drell PS, Favuzzi C, Focke WB, Fukazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Giglietto N, Giordano F, Giroletti M, Green D, Guiriec S, Harding AK, Jogler T, Jóhannesson G, Kamae T, Kuss M, Larsson S, Latronico L, Li J, Longo F, Loparco F, Lubrano P, Magill JD, Malyshev D, Manfreda A, Mazziotta MN, Meehan M, Michelson PF, Mitthumsiri W, Mizuno T, Moiseev AA, Monzani ME, Morselli A, Negro M, Nuss E, Ohsugi T, Omodei N, Paneque D, Perkins JS, Pesce-Rollins M, Piron F, Pivato G, Principe G, Rainò S, Rando R, Razzano M, Reimer A, Reimer O, Sgrò C, Simone D, Siskind EJ, Spada F, Spandre G, Spinelli P, Strong AW, Tajima H, Thayer JB, Torres DF, Troja E, Vandenbroucke J, Zaharijas G, and Zimmer S

Abstract

The Large Area Telescope on board the Fermi Gamma-ray Space Telescope has collected the largest ever sample of high-energy cosmic-ray electron and positron events since the beginning of its operation. Potential anisotropies in the arrival directions of cosmic-ray electrons or positrons could be a signature of the presence of nearby sources. We use almost seven years of data with energies above 42 GeV processed with the Pass 8 reconstruction. The present data sample can probe dipole anisotropies down to a level of 10^{-3}. We take into account systematic effects that could mimic true anisotropies at this level. We present a detailed study of the event selection optimization of the cosmic-ray electrons and positrons to be used for anisotropy searches. Since no significant anisotropies have been detected on any angular scale, we present upper limits on the dipole anisotropy. The present constraints are among the strongest to date probing the presence of nearby young and middle-aged sources.

Published
2017
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12. Testing Hadronic Interactions at Ultrahigh Energies with Air Showers Measured by the Pierre Auger Observatory.

Author

Aab A, Abreu P, Aglietta M, Ahn EJ, Al Samarai I, Albuquerque IF, Allekotte I, Allen JD, Allison P, Almela A, Alvarez Castillo J, Alvarez-Muñiz J, Ambrosio M, Anastasi GA, Anchordoqui L, Andrada B, Andringa S, Aramo C, Arqueros F, Arsene N, Asorey H, Assis P, Aublin J, Avila G, Badescu AM, Baus C, Beatty JJ, Becker KH, Bellido JA, Berat C, Bertaina ME, Bertou X, Biermann PL, Billoir P, Biteau J, Blaess SG, Blanco A, Blazek J, Bleve C, Blümer H, Boháčová M, Boncioli D, Bonifazi C, Borodai N, Botti AM, Brack J, Brancus I, Bretz T, Bridgeman A, Briechle FL, Buchholz P, Bueno A, Buitink S, Buscemi M, Caballero-Mora KS, Caccianiga B, Caccianiga L, Cancio A, Canfora F, Caramete L, Caruso R, Castellina A, Cataldi G, Cazon L, Cester R, Chavez AG, Chiavassa A, Chinellato JA, Chirinos Diaz JC, Chudoba J, Clay RW, Colalillo R, Coleman A, Collica L, Coluccia MR, Conceição R, Contreras F, Cooper MJ, Coutu S, Covault CE, Cronin J, Dallier R, D'Amico S, Daniel B, Dasso S, Daumiller K, Dawson BR, de Almeida RM, de Jong SJ, De Mauro G, de Mello Neto JR, De Mitri I, de Oliveira J, de Souza V, Debatin J, Del Peral L, Deligny O, Dhital N, Di Giulio C, Di Matteo A, Díaz Castro ML, Diogo F, Dobrigkeit C, D'Olivo JC, Dorofeev A, Dos Anjos RC, Dova MT, Dundovic A, Ebr J, Engel R, Erdmann M, Erfani M, Escobar CO, Espadanal J, Etchegoyen A, Falcke H, Fang K, Farrar GR, Fauth AC, Fazzini N, Ferguson AP, Fick B, Figueira JM, Filevich A, Filipčič A, Fratu O, Freire MM, Fujii T, Fuster A, Gallo F, García B, Garcia-Pinto D, Gate F, Gemmeke H, Gherghel-Lascu A, Ghia PL, Giaccari U, Giammarchi M, Giller M, Głas D, Glaser C, Glass H, Golup G, Gómez Berisso M, Gómez Vitale PF, González N, Gookin B, Gordon J, Gorgi A, Gorham P, Gouffon P, Griffith N, Grillo AF, Grubb TD, Guarino F, Guedes GP, Hampel MR, Hansen P, Harari D, Harrison TA, Harton JL, Hasankiadeh Q, Haungs A, Hebbeker T, Heck D, Heimann P, Herve AE, Hill GC, Hojvat C, Hollon N, Holt E, Homola P, Hörandel JR, Horvath P, Hrabovský M, Huege T, Hulsman J, Insolia A, Isar PG, Jandt I, Jansen S, Jarne C, Johnsen JA, Josebachuili M, Kääpä A, Kambeitz O, Kampert KH, Kasper P, Katkov I, Keilhauer B, Kemp E, Kieckhafer RM, Klages HO, Kleifges M, Kleinfeller J, Krause R, Krohm N, Kuempel D, Kukec Mezek G, Kunka N, Kuotb Awad A, LaHurd D, Latronico L, Lauscher M, Lautridou P, Lebrun P, Legumina R, Leigui de Oliveira MA, Letessier-Selvon A, Lhenry-Yvon I, Link K, Lopes L, López R, López Casado A, Lucero A, Malacari M, Mallamaci M, Mandat D, Mantsch P, Mariazzi AG, Marin V, Mariş IC, Marsella G, Martello D, Martinez H, Martínez Bravo O, Masías Meza JJ, Mathes HJ, Mathys S, Matthews J, Matthews JA, Matthiae G, Maurizio D, Mayotte E, Mazur PO, Medina C, Medina-Tanco G, Mello VB, Melo D, Menshikov A, Messina S, Micheletti MI, Middendorf L, Minaya IA, Miramonti L, Mitrica B, Molina-Bueno L, Mollerach S, Montanet F, Morello C, Mostafá M, Moura CA, Müller G, Muller MA, Müller S, Naranjo I, Navas S, Necesal P, Nellen L, Nelles A, Neuser J, Nguyen PH, Niculescu-Oglinzanu M, Niechciol M, Niemietz L, Niggemann T, Nitz D, Nosek D, Novotny V, Nožka H, Núñez LA, Ochilo L, Oikonomou F, Olinto A, Pakk Selmi-Dei D, Palatka M, Pallotta J, Papenbreer P, Parente G, Parra A, Paul T, Pech M, Pedreira F, Pękala J, Pelayo R, Peña-Rodriguez J, Pepe IM, Pereira LA, Perrone L, Petermann E, Peters C, Petrera S, Phuntsok J, Piegaia R, Pierog T, Pieroni P, Pimenta M, Pirronello V, Platino M, Plum M, Porowski C, Prado RR, Privitera P, Prouza M, Quel EJ, Querchfeld S, Quinn S, Rautenberg J, Ravel O, Ravignani D, Revenu B, Ridky J, Risse M, Ristori P, Rizi V, Rodrigues de Carvalho W, Rodriguez Rojo J, Rodríguez-Frías MD, Rogozin D, Rosado J, Roth M, Roulet E, Rovero AC, Saffi SJ, Saftoiu A, Salazar H, Saleh A, Salesa Greus F, Salina G, Sanabria Gomez JD, Sánchez F, Sanchez-Lucas P, Santos EM, Santos E, Sarazin F, Sarkar B, Sarmento R, Sarmiento-Cano C, Sato R, Scarso C, Schauer M, Scherini V, Schieler H, Schmidt D, Scholten O, Schoorlemmer H, Schovánek P, Schröder FG, Schulz A, Schulz J, Schumacher J, Sciutto SJ, Segreto A, Settimo M, Shadkam A, Shellard RC, Sigl G, Sima O, Śmiałkowski A, Šmída R, Snow GR, Sommers P, Sonntag S, Sorokin J, Squartini R, Stanca D, Stanič S, Stapleton J, Stasielak J, Strafella F, Stutz A, Suarez F, Suarez Durán M, Sudholz T, Suomijärvi T, Supanitsky AD, Sutherland MS, Swain J, Szadkowski Z, Taborda OA, Tapia A, Tepe A, Theodoro VM, Timmermans C, Todero Peixoto CJ, Tomankova L, Tomé B, Tonachini A, Torralba Elipe G, Torres Machado D, Travnicek P, Trini M, Ulrich R, Unger M, Urban M, Valbuena-Delgado A, Valdés Galicia JF, Valiño I, Valore L, van Aar G, van Bodegom P, van den Berg AM, van Vliet A, Varela E, Vargas Cárdenas B, Varner G, Vázquez JR, Vázquez RA, Veberič D, Verzi V, Vicha J, Videla M, Villaseñor L, Vorobiov S, Wahlberg H, Wainberg O, Walz D, Watson AA, Weber M, Weindl A, Wiencke L, Wilczyński H, Winchen T, Wittkowski D, Wundheiler B, Wykes S, Yang L, Yapici T, Yelos D, Zas E, Zavrtanik D, Zavrtanik M, Zepeda A, Zimmermann B, Ziolkowski M, Zong Z, and Zuccarello F

Abstract

Ultrahigh energy cosmic ray air showers probe particle physics at energies beyond the reach of accelerators. Here we introduce a new method to test hadronic interaction models without relying on the absolute energy calibration, and apply it to events with primary energy 6-16 EeV (E&#95;{CM}=110-170  TeV), whose longitudinal development and lateral distribution were simultaneously measured by the Pierre Auger Observatory. The average hadronic shower is 1.33±0.16 (1.61±0.21) times larger than predicted using the leading LHC-tuned models EPOS-LHC (QGSJetII-04), with a corresponding excess of muons.

Published
2016
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13. Measurement of the Radiation Energy in the Radio Signal of Extensive Air Showers as a Universal Estimator of Cosmic-Ray Energy.

Author

Aab A, Abreu P, Aglietta M, Ahn EJ, Al Samarai I, Albuquerque IF, Allekotte I, Allison P, Almela A, Alvarez Castillo J, Alvarez-Muñiz J, Alves Batista R, Ambrosio M, Aminaei A, Anastasi GA, Anchordoqui L, Andringa S, Aramo C, Arqueros F, Arsene N, Asorey H, Assis P, Aublin J, Avila G, Awal N, Badescu AM, Baus C, Beatty JJ, Becker KH, Bellido JA, Berat C, Bertaina ME, Bertou X, Biermann PL, Billoir P, Blaess SG, Blanco A, Blanco M, Blazek J, Bleve C, Blümer H, Boháčová M, Boncioli D, Bonifazi C, Borodai N, Brack J, Brancus I, Bretz T, Bridgeman A, Brogueira P, Buchholz P, Bueno A, Buitink S, Buscemi M, Caballero-Mora KS, Caccianiga B, Caccianiga L, Candusso M, Caramete L, Caruso R, Castellina A, Cataldi G, Cazon L, Cester R, Chavez AG, Chiavassa A, Chinellato JA, Chudoba J, Cilmo M, Clay RW, Cocciolo G, Colalillo R, Coleman A, Collica L, Coluccia MR, Conceição R, Contreras F, Cooper MJ, Cordier A, Coutu S, Covault CE, Cronin J, Dallier R, Daniel B, Dasso S, Daumiller K, Dawson BR, de Almeida RM, de Jong SJ, De Mauro G, de Mello Neto JR, De Mitri I, de Oliveira J, de Souza V, Del Peral L, Deligny O, Dhital N, Di Giulio C, Di Matteo A, Diaz JC, Díaz Castro ML, Diogo F, Dobrigkeit C, Docters W, D'Olivo JC, Dorofeev A, Dorosti Hasankiadeh Q, Dos Anjos RC, Dova MT, Ebr J, Engel R, Erdmann M, Erfani M, Escobar CO, Espadanal J, Etchegoyen A, Falcke H, Fang K, Farrar G, Fauth AC, Fazzini N, Ferguson AP, Fick B, Figueira JM, Filevich A, Filipčič A, Fratu O, Freire MM, Fujii T, García B, Garcia-Gamez D, Garcia-Pinto D, Gate F, Gemmeke H, Gherghel-Lascu A, Ghia PL, Giaccari U, Giammarchi M, Giller M, Głas D, Glaser C, Glass H, Golup G, Gómez Berisso M, Gómez Vitale PF, González N, Gookin B, Gordon J, Gorgi A, Gorham P, Gouffon P, Griffith N, Grillo AF, Grubb TD, Guarino F, Guedes GP, Hampel MR, Hansen P, Harari D, Harrison TA, Hartmann S, Harton JL, Haungs A, Hebbeker T, Heck D, Heimann P, Herve AE, Hill GC, Hojvat C, Hollon N, Holt E, Homola P, Hörandel JR, Horvath P, Hrabovský M, Huber D, Huege T, Insolia A, Isar PG, Jandt I, Jansen S, Jarne C, Johnsen JA, Josebachuili M, Kääpä A, Kambeitz O, Kampert KH, Kasper P, Katkov I, Keilhauer B, Kemp E, Kieckhafer RM, Klages HO, Kleifges M, Kleinfeller J, Krause R, Krohm N, Kuempel D, Kukec Mezek G, Kunka N, Kuotb Awad AW, LaHurd D, Latronico L, Lauer R, Lauscher M, Lautridou P, Le Coz S, Lebrun D, Lebrun P, Leigui de Oliveira MA, Letessier-Selvon A, Lhenry-Yvon I, Link K, Lopes L, López R, López Casado A, Louedec K, Lucero A, Malacari M, Mallamaci M, Maller J, Mandat D, Mantsch P, Mariazzi AG, Marin V, Mariş IC, Marsella G, Martello D, Martinez H, Martínez Bravo O, Martraire D, Masías Meza JJ, Mathes HJ, Mathys S, Matthews J, Matthews JA, Matthiae G, Maurizio D, Mayotte E, Mazur PO, Medina C, Medina-Tanco G, Meissner R, Mello VB, Melo D, Menshikov A, Messina S, Micheletti MI, Middendorf L, Minaya IA, Miramonti L, Mitrica B, Molina-Bueno L, Mollerach S, Montanet F, Morello C, Mostafá M, Moura CA, Muller MA, Müller G, Müller S, Navas S, Necesal P, Nellen L, Nelles A, Neuser J, Nguyen PH, Niculescu-Oglinzanu M, Niechciol M, Niemietz L, Niggemann T, Nitz D, Nosek D, Novotny V, Nožka L, Núñez LA, Ochilo L, Oikonomou F, Olinto A, Pacheco N, Pakk Selmi-Dei D, Palatka M, Pallotta J, Papenbreer P, Parente G, Parra A, Paul T, Pech M, Pȩkala J, Pelayo R, Pepe IM, Perrone L, Petermann E, Peters C, Petrera S, Petrov Y, Phuntsok J, Piegaia R, Pierog T, Pieroni P, Pimenta M, Pirronello V, Platino M, Plum M, Porcelli A, Porowski C, Prado RR, Privitera P, Prouza M, Quel EJ, Querchfeld S, Quinn S, Rautenberg J, Ravel O, Ravignani D, Reinert D, Revenu B, Ridky J, Risse M, Ristori P, Rizi V, Rodrigues de Carvalho W, Rodriguez Rojo J, Rodríguez-Frías MD, Rogozin D, Rosado J, Roth M, Roulet E, Rovero AC, Saffi SJ, Saftoiu A, Salazar H, Saleh A, Salesa Greus F, Salina G, Sanabria Gomez JD, Sánchez F, Sanchez-Lucas P, Santos E, Santos EM, Sarazin F, Sarkar B, Sarmento R, Sarmiento-Cano C, Sato R, Scarso C, Schauer M, Scherini V, Schieler H, Schmidt D, Scholten O, Schoorlemmer H, Schovánek P, Schröder FG, Schulz A, Schulz J, Schumacher J, Sciutto SJ, Segreto A, Settimo M, Shadkam A, Shellard RC, Sigl G, Sima O, Śmiałkowski A, Šmída R, Snow GR, Sommers P, Sonntag S, Sorokin J, Squartini R, Srivastava YN, Stanca D, Stanič S, Stapleton J, Stasielak J, Stephan M, Stutz A, Suarez F, Suarez Durán M, Suomijärvi T, Supanitsky AD, Sutherland MS, Swain J, Szadkowski Z, Taborda OA, Tapia A, Tepe A, Theodoro VM, Timmermans C, Todero Peixoto CJ, Toma G, Tomankova L, Tomé B, Tonachini A, Torralba Elipe G, Torres Machado D, Travnicek P, Trini M, Ulrich R, Unger M, Urban M, Valdés Galicia JF, Valiño I, Valore L, van Aar G, van Bodegom P, van den Berg AM, van Velzen S, van Vliet A, Varela E, Vargas Cárdenas B, Varner G, Vasquez R, Vázquez JR, Vázquez RA, Veberič D, Verzi V, Vicha J, Videla M, Villaseñor L, Vlcek B, Vorobiov S, Wahlberg H, Wainberg O, Walz D, Watson AA, Weber M, Weidenhaupt K, Weindl A, Welling C, Werner F, Widom A, Wiencke L, Wilczyński H, Winchen T, Wittkowski D, Wundheiler B, Wykes S, Yang L, Yapici T, Yushkov A, Zas E, Zavrtanik D, Zavrtanik M, Zepeda A, Zimmermann B, Ziolkowski M, and Zuccarello F

Abstract

We measure the energy emitted by extensive air showers in the form of radio emission in the frequency range from 30 to 80 MHz. Exploiting the accurate energy scale of the Pierre Auger Observatory, we obtain a radiation energy of 15.8±0.7(stat)±6.7(syst)  MeV for cosmic rays with an energy of 1 EeV arriving perpendicularly to a geomagnetic field of 0.24 G, scaling quadratically with the cosmic-ray energy. A comparison with predictions from state-of-the-art first-principles calculations shows agreement with our measurement. The radiation energy provides direct access to the calorimetric energy in the electromagnetic cascade of extensive air showers. Comparison with our result thus allows the direct calibration of any cosmic-ray radio detector against the well-established energy scale of the Pierre Auger Observatory.

Published
2016
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14. Search for Spectral Irregularities due to Photon-Axionlike-Particle Oscillations with the Fermi Large Area Telescope.

Author

Ajello M, Albert A, Anderson B, Baldini L, Barbiellini G, Bastieri D, Bellazzini R, Bissaldi E, Blandford RD, Bloom ED, Bonino R, Bottacini E, Bregeon J, Bruel P, Buehler R, Caliandro GA, Cameron RA, Caragiulo M, Caraveo PA, Cecchi C, Chekhtman A, Ciprini S, Cohen-Tanugi J, Conrad J, Costanza F, D'Ammando F, de Angelis A, de Palma F, Desiante R, Di Mauro M, Di Venere L, Domínguez A, Drell PS, Favuzzi C, Focke WB, Franckowiak A, Fukazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Giglietto N, Glanzman T, Godfrey G, Guiriec S, Horan D, Jóhannesson G, Katsuragawa M, Kensei S, Kuss M, Larsson S, Latronico L, Li J, Li L, Longo F, Loparco F, Lubrano P, Madejski GM, Maldera S, Manfreda A, Mayer M, Mazziotta MN, Meyer M, Michelson PF, Mirabal N, Mizuno T, Monzani ME, Morselli A, Moskalenko IV, Murgia S, Negro M, Nuss E, Okada C, Orlando E, Ormes JF, Paneque D, Perkins JS, Pesce-Rollins M, Piron F, Pivato G, Porter TA, Rainò S, Rando R, Razzano M, Reimer A, Sánchez-Conde M, Sgrò C, Simone D, Siskind EJ, Spada F, Spandre G, Spinelli P, Takahashi H, Thayer JB, Torres DF, Tosti G, Troja E, Uchiyama Y, Wood KS, Wood M, Zaharijas G, and Zimmer S

Abstract

We report on the search for spectral irregularities induced by oscillations between photons and axionlike-particles (ALPs) in the γ-ray spectrum of NGC 1275, the central galaxy of the Perseus cluster. Using 6 years of Fermi Large Area Telescope data, we find no evidence for ALPs and exclude couplings above 5×10^{-12}  GeV^{-1} for ALP masses 0.5≲m&#95;{a}≲5  neV at 95% confidence. The limits are competitive with the sensitivity of planned laboratory experiments, and, together with other bounds, strongly constrain the possibility that ALPs can reduce the γ-ray opacity of the Universe.

Published
2016
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15. Searching for Dark Matter Annihilation from Milky Way Dwarf Spheroidal Galaxies with Six Years of Fermi Large Area Telescope Data.

Author

Ackermann M, Albert A, Anderson B, Atwood WB, Baldini L, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Bissaldi E, Blandford RD, Bloom ED, Bonino R, Bottacini E, Brandt TJ, Bregeon J, Bruel P, Buehler R, Caliandro GA, Cameron RA, Caputo R, Caragiulo M, Caraveo PA, Cecchi C, Charles E, Chekhtman A, Chiang J, Chiaro G, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, Cuoco A, Cutini S, D'Ammando F, de Angelis A, de Palma F, Desiante R, Digel SW, Di Venere L, Drell PS, Drlica-Wagner A, Essig R, Favuzzi C, Fegan SJ, Ferrara EC, Focke WB, Franckowiak A, Fukazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Giglietto N, Giordano F, Giroletti M, Glanzman T, Godfrey G, Gomez-Vargas GA, Grenier IA, Guiriec S, Gustafsson M, Hays E, Hewitt JW, Horan D, Jogler T, Jóhannesson G, Kuss M, Larsson S, Latronico L, Li J, Li L, Llena Garde M, Longo F, Loparco F, Lubrano P, Malyshev D, Mayer M, Mazziotta MN, McEnery JE, Meyer M, Michelson PF, Mizuno T, Moiseev AA, Monzani ME, Morselli A, Murgia S, Nuss E, Ohsugi T, Orienti M, Orlando E, Ormes JF, Paneque D, Perkins JS, Pesce-Rollins M, Piron F, Pivato G, Porter TA, Rainò S, Rando R, Razzano M, Reimer A, Reimer O, Ritz S, Sánchez-Conde M, Schulz A, Sehgal N, Sgrò C, Siskind EJ, Spada F, Spandre G, Spinelli P, Strigari L, Tajima H, Takahashi H, Thayer JB, Tibaldo L, Torres DF, Troja E, Vianello G, Werner M, Winer BL, Wood KS, Wood M, Zaharijas G, and Zimmer S

Abstract

The dwarf spheroidal satellite galaxies (dSphs) of the Milky Way are some of the most dark matter (DM) dominated objects known. We report on γ-ray observations of Milky Way dSphs based on six years of Fermi Large Area Telescope data processed with the new Pass8 event-level analysis. None of the dSphs are significantly detected in γ rays, and we present upper limits on the DM annihilation cross section from a combined analysis of 15 dSphs. These constraints are among the strongest and most robust to date and lie below the canonical thermal relic cross section for DM of mass ≲100  GeV annihilating via quark and τ-lepton channels.

Published
2015
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16. Search for patterns by combining cosmic-ray energy and arrival directions at the Pierre Auger Observatory.

Author

Aab A, Abreu P, Aglietta M, Ahn EJ, Samarai IA, Albuquerque IF, Allekotte I, Allen J, Allison P, Almela A, Castillo JA, Alvarez-Muñiz J, Batista RA, Ambrosio M, Aminaei A, Anchordoqui L, Andringa S, Aramo C, Aranda VM, Arqueros F, Asorey H, Assis P, Aublin J, Ave M, Avenier M, Avila G, Awal N, Badescu AM, Barber KB, Bäuml J, Baus C, Beatty JJ, Becker KH, Bellido JA, Berat C, Bertaina ME, Bertou X, Biermann PL, Billoir P, Blaess S, Blanco M, Bleve C, Blümer H, Boháčová M, Boncioli D, Bonifazi C, Bonino R, Borodai N, Brack J, Brancus I, Bridgeman A, Brogueira P, Brown WC, Buchholz P, Bueno A, Buitink S, Buscemi M, Caballero-Mora KS, Caccianiga B, Caccianiga L, Candusso M, Caramete L, Caruso R, Castellina A, Cataldi G, Cazon L, Cester R, Chavez AG, Chiavassa A, Chinellato JA, Chudoba J, Cilmo M, Clay RW, Cocciolo G, Colalillo R, Coleman A, Collica L, Coluccia MR, Conceição R, Contreras F, Cooper MJ, Cordier A, Coutu S, Covault CE, Cronin J, Curutiu A, Dallier R, Daniel B, Dasso S, Daumiller K, Dawson BR, Almeida RM, Domenico M, Jong SJ, Neto JR, Mitri I, Oliveira J, Souza V, Peral LD, Deligny O, Dembinski H, Dhital N, Giulio CD, Matteo AD, Diaz JC, Castro ML, Diogo F, Dobrigkeit C, Docters W, D'Olivo JC, Dorofeev A, Hasankiadeh QD, Dova MT, Ebr J, Engel R, Erdmann M, Erfani M, Escobar CO, Espadanal J, Etchegoyen A, Luis PF, Falcke H, Fang K, Farrar G, Fauth AC, Fazzini N, Ferguson AP, Fernandes M, Fick B, Figueira JM, Filevich A, Filipčič A, Fox BD, Fratu O, Fröhlich U, Fuchs B, Fujii T, Gaior R, García B, Roca ST, Garcia-Gamez D, Garcia-Pinto D, Garilli G, Bravo AG, Gate F, Gemmeke H, Ghia PL, Giaccari U, Giammarchi M, Giller M, Glaser C, Glass H, Berisso MG, Vitale PF, Gonçalves P, Gonzalez JG, González N, Gookin B, Gordon J, Gorgi A, Gorham P, Gouffon P, Grebe S, Griffith N, Grillo AF, Grubb TD, Guarino F, Guedes GP, Hampel MR, Hansen P, Harari D, Harrison TA, Hartmann S, Harton JL, Haungs A, Hebbeker T, Heck D, Heimann P, Herve AE, Hill GC, Hojvat C, Hollon N, Holt E, Homola P, Hörandel JR, Horvath P, Hrabovský M, Huber D, Huege T, Insolia A, Isar PG, Jandt I, Jansen S, Jarne C, Josebachuili M, Kääpä A, Kambeitz O, Kampert KH, Kasper P, Katkov I, Kégl B, Keilhauer B, Keivani A, Kemp E, Kieckhafer RM, Klages HO, Kleifges M, Kleinfeller J, Krause R, Krohm N, Krömer O, Kruppke-Hansen D, Kuempel D, Kunka N, LaHurd D, Latronico L, Lauer R, Lauscher M, Lautridou P, Coz SL, Leão MS, Lebrun D, Lebrun P, Oliveira MA, Letessier-Selvon A, Lhenry-Yvon I, Link K, López R, Agüera AL, Louedec K, Bahilo JL, Lu L, Lucero A, Ludwig M, Malacari M, Maldera S, Mallamaci M, Maller J, Mandat D, Mantsch P, Mariazzi AG, Marin V, Mariş IC, Marsella G, Martello D, Martin L, Martinez H, Bravo OM, Martraire D, Meza JJ, Mathes HJ, Mathys S, Matthews J, Matthews JA, Matthiae G, Maurel D, Maurizio D, Mayotte E, Mazur PO, Medina C, Medina-Tanco G, Meissner R, Melissas M, Melo D, Menshikov A, Messina S, Meyhandan R, Mićanović S, Micheletti MI, Middendorf L, Minaya IA, Miramonti L, Mitrica B, Molina-Bueno L, Mollerach S, Monasor M, Ragaigne DM, Montanet F, Morello C, Mostafá M, Moura CA, Muller MA, Müller G, Müller S, Münchmeyer M, Mussa R, Navarra G, Navas S, Necesal P, Nellen L, Nelles A, Neuser J, Nguyen P, Niechciol M, Niemietz L, Niggemann T, Nitz D, Nosek D, Novotny V, Nožka L, Ochilo L, Olinto A, Oliveira M, Pacheco N, Selmi-Dei DP, Palatka M, Pallotta J, Palmieri N, Papenbreer P, Parente G, Parra A, Paul T, Pech M, Pȩkala J, Pelayo R, Pepe IM, Perrone L, Petermann E, Peters C, Petrera S, Petrov Y, Phuntsok J, Piegaia R, Pierog T, Pieroni P, Pimenta M, Pirronello V, Platino M, Plum M, Porcelli A, Porowski C, Prado RR, Privitera P, Prouza M, Purrello V, Quel EJ, Querchfeld S, Quinn S, Rautenberg J, Ravel O, Ravignani D, Revenu B, Ridky J, Riggi S, Risse M, Ristori P, Rizi V, Carvalho WR, Cabo IR, Fernandez GR, Rojo JR, Rodríguez-Frías MD, Rogozin D, Ros G, Rosado J, Rossler T, Roth M, Roulet E, Rovero AC, Saffi SJ, Saftoiu A, Salamida F, Salazar H, Saleh A, Greus FS, Salina G, Sánchez F, Sanchez-Lucas P, Santo CE, Santos E, Santos EM, Sarazin F, Sarkar B, Sarmento R, Sato R, Scharf N, Scherini V, Schieler H, Schiffer P, Schmidt D, Schröder FG, Scholten O, Schoorlemmer H, Schovánek P, Schulz A, Schulz J, Schumacher J, Sciutto SJ, Segreto A, Settimo M, Shadkam A, Shellard RC, Sidelnik I, Sigl G, Sima O, Kowski AŚ, Šmída R, Snow GR, Sommers P, Sorokin J, Squartini R, Srivastava YN, Stanič S, Stapleton J, Stasielak J, Stephan M, Stutz A, Suarez F, Suomijärvi T, Supanitsky AD, Sutherland MS, Swain J, Szadkowski Z, Szuba M, Taborda OA, Tapia A, Tartare M, Tepe A, Theodoro VM, Timmermans C, Peixoto CJ, Toma G, Tomankova L, Tomé B, Tonachini A, Elipe GT, Machado DT, Travnicek P, Trovato E, Tueros M, Ulrich R, Unger M, Urban M, Galicia JF, Valiño I, Valore L, Aar GV, Bodegom PV, Berg AM, Velzen SV, Vliet AV, Varela E, Vargas Cárdenas B, Varner G, Vázquez JR, Vázquez RA, Veberič D, Verzi V, Vicha J, Videla M, Villaseñor L, Vlcek B, Vorobiov S, Wahlberg H, Wainberg O, Walz D, Watson AA, Weber M, Weidenhaupt K, Weindl A, Werner F, Widom A, Wiencke L, Wilczyńska B, Wilczyński H, Will M, Williams C, Winchen T, Wittkowski D, Wundheiler B, Wykes S, Yamamoto T, Yapici T, Yuan G, Yushkov A, Zamorano B, Zas E, Zavrtanik D, Zavrtanik M, Zaw I, Zepeda A, Zhou J, Zhu Y, Silva MZ, Ziolkowski M, and Zuccarello F

Abstract

Energy-dependent patterns in the arrival directions of cosmic rays are searched for using data of the Pierre Auger Observatory. We investigate local regions around the highest-energy cosmic rays with [Formula: see text] eV by analyzing cosmic rays with energies above [Formula: see text] eV arriving within an angular separation of approximately 15[Formula: see text]. We characterize the energy distributions inside these regions by two independent methods, one searching for angular dependence of energy-energy correlations and one searching for collimation of energy along the local system of principal axes of the energy distribution. No significant patterns are found with this analysis. The comparison of these measurements with astrophysical scenarios can therefore be used to obtain constraints on related model parameters such as strength of cosmic-ray deflection and density of point sources.

Published
2015
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17. Maximum-likelihood reconstruction of photon returns from simultaneous analog and photon-counting lidar measurements.

Author

Veberič D

Abstract

We present a novel method for combining the analog and photon-counting measurements of lidar transient recorders into reconstructed photon returns. The method takes into account the statistical properties of the two measurement modes and estimates the most likely number of arriving photons and the most likely values of acquisition parameters describing the two measurement modes. It extends and improves the standard combining ("gluing") methods and does not rely on any ad hoc definitions of the overlap region nor on any background subtraction methods., (© 2012 Optical Society of America)

Published
2012
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