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374 results on '"Wittek, W."'

352. The reactions K+d → K+d, K+d → K+pn and K+d → K0pp at 3 Ge V/c with an investigation of K+n scattering

Author

Buchner, K., primary, Dehm, G., additional, Geist, W., additional, Göbel, G., additional, Hupe, H., additional, Mittra, I.S., additional, Pagnamenta, A., additional, Wittek, W., additional, Wolf, G., additional, Crispeels, J.M., additional, De Jongh, G., additional, Delabaye, M., additional, Dufour, P., additional, Grard, F., additional, Naisse, J., additional, Tavernier, S., additional, Thill, G., additional, Goldschmidt-Clermont, Y., additional, Grant, A., additional, Henri, V.P., additional, Jongejans, B., additional, Sekulin, R.L., additional, and Shafi, M., additional

Published
1972
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353. Coherent K∗ production in K+d reactions at 3 GeV/c

Author

Buchner, K., primary, Dehm, G., additional, Goebel, G., additional, Hupe, H., additional, Joldersma, T., additional, Mittra, I.S., additional, Wittek, W., additional, Crispeels, J.M., additional, Debaisieux, J., additional, Delabaye, M., additional, Dufour, P., additional, Grard, F., additional, Heughebaert, J., additional, Naisse, J., additional, Thill, G., additional, Grant, A., additional, Henri, V.P., additional, Jongejans, B., additional, Kundt, U., additional, Muller, F., additional, Sekulin, R.L., additional, and Wolf, G., additional

Published
1969
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354. Observation ofDS** (2536) meson production by neutrinos in BEBC

Author

Asratyan, A. E., Aderholz, M., Ammosov, V. V., Gapienko, G. S., Gapienko, V. A., Guy, J., Jones, G. T., Kaftanov, V. S., Katz, U. F., Kern, J., Korotkov, V. A., Krutchinin, S. P., Kubantsev, M. A., Marage, P., Morrison, D. R. O., Sacton, J., Schmitz, N., Varvell, K., Venus, W., Wittek, W., and Zaetz, V. G.

Abstract

Neutrino interactions in BEBC produce theDS** (2536) charmed strange meson. The mass of this state is 2534.2±1.2 MeV. The production rate is 0.011±0.005 per neutrino charged current interaction at a mean neutrino energy of 61 GeV. An earlier claim for another " bound state near 2565 MeV, produced in neutrino interactions, is not supported.

Published
1994
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358. Determination of the quark density ratio [formula omitted] in the proton

Author

Allen, P., Grässler, H., Lanske, D., Schulte, R., Böckmann, K., Geich-Gimbel, C., Kokott, T., Nellen, B., Pech, R., Saarikko, H., Bosetti, P.C., Cocconi, V.T., Cundy, D.C., Grant, A., Hulth, P.O., Morrison, D.R.O., Pape, L., Peyrou, Ch., Schmid, P., Scott, W.G., Simopoulou, E., Wachsmuth, H., Aderholz, M., Schmitz, N., Settles, R., Wernhard, K.L., Wittek, W., Batley, R., Giles, R., Grossmann, P., Myatt, G., Perkins, D.H., Radojicic, D., Renton, P., and Saitta, B.

Published
1981
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359. Spin alignment of ρ 0 mesons produced in antineutrino and neutrino neon charged-current interactions

Author

Wittek, W., Guy, J., Adeholz, M., Allport, P., Baton, J.P., Berggren, M., Bertrand, D., Brisson, V., Bullock, F.W., Burkot, W., Calicchio, M., Clayton, E.F., Coghen, T., Cooper-Sarkar, A.M., Erriquez, O., Fitch, P.J., Fogli-Muciaccia, M.T., Hulth, P.O., Jones, G.T., Kasper, P., Klein, H., Marage, P., Middleton, R.P., Miller, D.B., Mobayyen, M.M., Morrison, D.R.O., Neveu, M., O'Neale, S.W., Parker, M.A., Petiau, P., Sacton, J., Sansum, R.A., Schmitz, N., Simopoulou, E., Vallee, C., Varvell, K., Vayaki, A., Venus, W., Wachsmuth, H., and Wells, J.

Published
1987
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360. Measurement of the ratio [formula omitted] in inelastic muon-nucleon scattering at very low χ and Q2

Author

Adams, M.R., Aïd, S., Anthony, P.L., Baker, M.D., Bartlett, J., Bhatti, A.A., Braun, H.M., Busza, W., Carroll, T.J., Conrad, J.M., Coutrakon, G., Davisson, R., Derado, I., Dhawan, S.K., Dougherty, W., Dreyer, T., Dziunikowska, K., Eckardt, V., Ecker, U., Erdmann, M., Eskreys, A., Figiel, J., Gebauer, H.J., Geesaman, D.F., Gilman, R., Green, M.C., Haas, J., Halliwell, C., Hanlon, J., Hantke, D., Hughes, V.W., Jackson, H.E., Jaffe, D.E., Jancso, G., Jansen, D.M., Kaufman, S., Kennedy, R.D., Kirk, T., Kobrak, H.G.E., Krzywdzinski, S., Kunori, S., Lord, J.J., Lubatti, H.J., McLeod, D., Magill, S., Malecki, P., Manz, A., Melanson, H., Michael, D.G., Mohr, W., Montgomery, H.E., Morfin, J.G., Nickerson, R.B., O'Day, S., Olkiewicz, K., Osborne, L., Papavassiliou, V., Pawlik, B., Pipkin, F.M., Ramberg, E.J., Röser, A., Ryan, J.J., Salvarani, A., Schellman, H., Schmitt, M., Schmitz, N., Schüler, K.P., Seyerlein, H.J., Skuja, A., Snow, G.A., Söldner-Rembold, S., Steinberg, P.H., Stier, H.E., Stopa, P., Swanson, R.A., Talaga, R., Tentindo-Repond, S., Trost, H.-J., Venkataramania, H., Vidal, M., Wilhelm, M., Wilkes, J., Wilson, Richard, Wittek, W., Wolbers, S.A., and Zhao, T.

Published
1993
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361. Charge properties of the hadronic system in vp and [formula omitted] interactions

Author

Allen, P., Grässler, H., Lanske, D., Schulte, R., Böckmann, K., Geich-Gimbel, C., Nellen, B., Saarikko, H., Bosetti, P., Cocconi, V.T., Grant, A., Hulth, P.O., Klein, H., Morrison, D.R.O., Peyrou, Ch., Schmid, P., Sliwa, K., Wachsmuth, H., Aderholz, M., Coghen, T., Schmitz, N., Settles, R., Steinfeld, P., Wernhard, K.L., Wittek, W., Batley, R., Myatt, G., and Saitta, B.

Published
1982
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363. Production of D s∗- mesons in antineutrino-neon charged current interactions

Author

Asratyan, A.E., Marage, P., Neveu, M., Ammosov, V.V., Andryakov, A.D., Baton, J.P., Berggren, M., Burtovoy, V.S., Coghen, T., Erriquez, O., Gapienko, G.S., Gapienko, V.A., Guy, J., Jones, G.T., Kaftanov, V.S., Klyukhin, V.I., Korotkov, V.A., Krutchinin, S.P., Kubantsev, M.A., Makhlueva, I.V., Morrison, D.R.O., Pitukhin, P.V., Sacton, J., Varvell, K.E., Venus, W., Wallenborn, G., Willocq, S., Wittek, W., and Zaetz, V.G.

Published
1991
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365. K +n charge exchange reaction at 3 GeV/c

Author

Goldschmidt-Clermont, Y., Henri, V.P., Jongejans, B., Kundt, U., Muller, F., Sekulin, R.L., Shafi, M., Wolf, G., Crispeels, J.M., Debaisieux, J., Delabaye, M., Dufour, P., Grard, F., Heughebaert, J., Naisse, J., Thill, G., Windmolders, R., Buchner, K., Dehm, G., Goebel, G., Hupe, H., Joldersma, T., Mittra, I.S., and Wittek, W.

Published
1968
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366. Methods for multidimensional event classification: a case study using images from a Cherenkov gamma-ray telescope

Author

Bock, R.K., Chilingarian, A., Gaug, M., Hakl, F., Hengstebeck, T., Jiřina, M., Klaschka, J., Kotrč, E., Savický, P., Towers, S., Vaiciulis, A., and Wittek, W.

Subjects
*MONTE Carlo method, *CHERENKOV radiation, *TELESCOPES, *MULTIVARIATE analysis
Abstract

We present results from a case study comparing different multivariate classification methods. The input is a set of Monte Carlo data, generated and approximately triggered and pre-processed for an imaging gamma-ray Cherenkov telescope. Such data belong to two classes, originating either from incident gamma rays or caused by hadronic showers. There is only a weak discrimination between signal (gamma) and background (hadrons), making the data an excellent proving ground for classification techniques.The data and methods are described, and a comparison of the results is made. Several methods give results comparable in quality within small fluctuations, suggesting that they perform at or close to the Bayesian limit of achievable separation. Other methods give clearly inferior or inconclusive results. Some problems that this study can not address are also discussed. [Copyright &y& Elsevier]

Published
2004
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367. THE JUNE 2008 FLARE OF MARKARIAN 421 FROM OPTICAL TO TeV ENERGIES

Author

I. Donnarumma, V. Vittorini, S. Vercellone, E. Del Monte, M. Feroci, F. D'Ammando, L. Pacciani, A. W. Chen, M. Tavani, A. Bulgarelli, A. Giuliani, F. Longo, G. Pucella, A. Argan, G. Barbiellini, F. Boffelli, P. Caraveo, P. W. Cattaneo, V. Cocco, E. Costa, G. De Paris, G. Di Cocco, Y. Evangelista, M. Fiorini, T. Froysland, M. Frutti, F. Fuschino, M. Galli, F. Gianotti, C. Labanti, I. Lapshov, F. Lazzarotto, P. Lipari, M. Marisaldi, M. Mastropietro, S. Mereghetti, E. Morelli, A. Morselli, A. Pellizzoni, F. Perotti, P. Picozza, G. Porrovecchio, M. Prest, M. Rapisarda, A. Rappoldi, A. Rubini, P. Soffitta, M. Trifoglio, A. Trois, E. Vallazza, A. Zambra, D. Zanello, C. Pittori, P. Santolamazza, F. Verrecchia, P. Giommi, S. Colafrancesco, L. Salotti, M. Villata, C. M. Raiteri, W. P. Chen, N. V. Efimova, B. Jordan, T. S. Konstantinova, E. Koptelova, O. M. Kurtanidze, V. M. Larionov, J. A. Ros, A. C. Sadun, H. Anderhub, L. A. Antonelli, P. Antoranz, M. Backes, C. Baixeras, S. Balestra, J. A. Barrio, H. Bartko, D. Bastieri, J. Becerra González, J. K. Becker, W. Bednarek, K. Berger, E. Bernardini, A. Biland, R. K. Bock, G. Bonnoli, P. Bordas, D. Borla Tridon, V. Bosch-Ramon, T. Bretz, I. Britvitch, M. Camara, E. Carmona, A. Chilingarian, S. Commichau, J. L. Contreras, J. Cortina, M. T. Costado, S. Covino, V. Curtef, F. Dazzi, A. De Angelis, E. De Cea del Pozo, R. de los Reyes, B. De Lotto, M. De Maria, F. De Sabata, C. Delgado Mendez, A. Dominguez, D. Dorner, M. Doro, D. Elsaesser, M. Errando, D. Ferenc, E. Fernández, R. Firpo, M. V. Fonseca, L. Font, N. Galante, R. J. García López, M. Garczarczyk, M. Gaug, F. Goebel, D. Hadasch, M. Hayashida, A. Herrero, D. Höhne-Mönch, J. Hose, C. C. Hsu, S. Huber, T. Jogler, D. Kranich, A. La Barbera, A. Laille, E. Leonardo, E. Lindfors, S. Lombardi, M. López, E. Lorenz, P. Majumdar, G. Maneva, N. Mankuzhiyil, K. Mannheim, L. Maraschi, M. Mariotti, M. Martínez, D. Mazin, M. Meucci, M. Meyer, J. M. Miranda, R. Mirzoyan, J. Moldón, M. Moles, A. Moralejo, D. Nieto, K. Nilsson, J. Ninkovic, I. Oya, R. Paoletti, J. M. Paredes, M. Pasanen, D. Pascoli, F. Pauss, R. G. Pegna, M. A. Perez-Torres, M. Persic, L. Peruzzo, F. Prada, E. Prandini, N. Puchades, A. Raymers, W. Rhode, M. Ribó, J. Rico, M. Rissi, A. Robert, S. Rügamer, A. Saggion, T. Y. Saito, M. Salvati, M. Sanchez-Conde, P. Sartori, K. Satalecka, V. Scalzotto, V. Scapin, T. Schweizer, M. Shayduk, K. Shinozaki, S. N. Shore, N. Sidro, A. Sierpowska-Bartosik, A. Sillanpää, J. Sitarek, D. Sobczynska, F. Spanier, A. Stamerra, L. S. Stark, L. Takalo, F. Tavecchio, P. Temnikov, D. Tescaro, M. Teshima, M. Tluczykont, D. F. Torres, N. Turini, H. Vankov, A. Venturini, V. Vitale, R. M. Wagner, W. Wittek, V. Zabalza, F. Zandanel, R. Zanin, J. Zapatero, V. Acciari, E. Aliu, T. Arlen, M. Beilicke, W. Benbow, S. M. Bradbury, J. H. Buckley, V. Bugaev, Y. Butt, K. Byrum, A. Cannon, A. Cesarini, Y. C. Chow, L. Ciupik, P. Cogan, P. Colin, W. Cui, M. K. Daniel, R. Dickherber, C. Duke, T. Ergin, S. J. Fegan, J. P. Finley, G. Finnegan, P. Fortin, A. Furniss, D. Gall, G. H. Gillanders, R. Guenette, G. Gyuk, J. Grube, D. Hanna, J. Holder, D. Horan, C. M. Hui, T. Brian Humensky, A. Imran, P. Kaaret, N. Karlsson, M. Kertzman, D. Kieda, J. Kildea, A. Konopelko, H. Krawczynski, F. Krennrich, M. J. Lang, S. LeBohec, G. Maier, A. McCann, M. McCutcheon, A. Milovanovic, P. Moriarty, T. Nagai, R. A. Ong, A. N. Otte, D. Pandel, J. S. Perkins, A. Pichel, M. Pohl, K. Ragan, L. C. Reyes, P. T. Reynolds, E. Roache, H. J. Rose, M. Schroedter, G. H. Sembroski, A. W. Smith, D. Steele, S. P. Swordy, M. Theiling, J. A. Toner, L. Valcarcel, A. Varlotta, S. P. Wakely, J. E. Ward, T. C. Weekes, A. Weinstein, D. A. Williams, S. Wissel, M. Wood, B. Zitzer, I., Donnarumma, V., Vittorini, S., Vercellone, E. D., Monte, M., Feroci, F., D'Ammando, L., Pacciani, A. W., Chen, M., Tavani, A., Bulgarelli, A., Giuliani, Longo, Francesco, G., Pucella, A., Argan, G., Barbiellini, F., Boffelli, P., Caraveo, P. W., Cattaneo, V., Cocco, E., Costa, G. D., Pari, G. D., Cocco, Y., Evangelista, M., Fiorini, T., Froysland, M., Frutti, F., Fuschino, M., Galli, F., Gianotti, C., Labanti, I., Lapshov, F., Lazzarotto, P., Lipari, M., Marisaldi, M., Mastropietro, S., Mereghetti, E., Morelli, A., Morselli, A., Pellizzoni, F., Perotti, P., Picozza, G., Porrovecchio, M., Prest, M., Rapisarda, A., Rappoldi, A., Rubini, P., Soffitta, M., Trifoglio, A., Troi, E., Vallazza, A., Zambra, D., Zanello, C., Pittori, P., Santolamazza, F., Verrecchia, P., Giommi, S., Colafrancesco, L., Salotti, M., Villata, C. M., Raiteri, W. P., Chen, N. V., Efimova, B., Jordan, T. S., Konstantinova, E., Koptelova, O. M., Kurtanidze, V. M., Larionov, J. A., Ro, A. C., Sadun, H., Anderhub, L. A., Antonelli, P., Antoranz, M., Backe, C., Baixera, S., Balestra, J. A., Barrio, H., Bartko, D., Bastieri, J. B., Gonzalez, J. K., Becker, W., Bednarek, K., Berger, E., Bernardini, A., Biland, R. K., Bock, G., Bonnoli, P., Borda, D. B., Tridon, V., Bosch Ramon, T., Bretz, I., Britvitch, M., Camara, E., Carmona, A., Chilingarian, S., Commichau, J. L., Contrera, J., Cortina, M. T., Costado, S., Covino, V., Curtef, F., Dazzi, A. D., Angeli, E. D., Del Pozo, R. D., Reye, B. D., Lotto, M. D., Maria, F. D., Sabata, C. D., Mendez, A., Dominguez, D., Dorner, M., Doro, D., Elsaesser, M., Errando, D., Ferenc, E., Fernandez, R., Firpo, M. V., Fonseca, L., Font, N., Galante, R. J. G., Lopez, M., Garczarczyk, M., Gaug, F., Goebel, D., Hadasch, M., Hayashida, A., Herrero, D., Hohne Monch, J., Hose, C. C., Hsu, S., Huber, T., Jogler, D., Kranich, A. L., Barbera, A., Laille, E., Leonardo, E., Lindfor, S., Lombardi, M., Lopez, E., Lorenz, P., Majumdar, G., Maneva, N., Mankuzhiyil, K., Mannheim, L., Maraschi, M., Mariotti, M., Martinez, D., Mazin, M., Meucci, M., Meyer, J. M., Miranda, R., Mirzoyan, J., Moldon, M., Mole, A., Moralejo, D., Nieto, K., Nilsson, J., Ninkovic, I., Oya, R., Paoletti, J. M., Parede, M., Pasanen, D., Pascoli, F., Pau, R. G., Pegna, M. A., Perez Torre, M., Persic, L., Peruzzo, F., Prada, E., Prandini, N., Puchade, A., Raymer, W., Rhode, M., Ribo, J., Rico, M., Rissi, A., Robert, S., Rugamer, A., Saggion, T. Y., Saito, M., Salvati, M., Sanchez Conde, P., Sartori, K., Satalecka, V., Scalzotto, V., Scapin, T., Schweizer, M., Shayduk, K., Shinozaki, S. N., Shore, N., Sidro, A., Sierpowska Bartosik, A., Sillanpaa, J., Sitarek, D., Sobczynska, F., Spanier, A., Stamerra, L. S., Stark, L., Takalo, F., Tavecchio, P., Temnikov, D., Tescaro, M., Teshima, M., Tluczykont, D. F., Torre, N., Turini, H., Vankov, A., Venturini, V., Vitale, R. M., Wagner, W., Wittek, V., Zabalza, F., Zandanel, R., Zanin, J., Zapatero, V., Acciari, E., Aliu, T., Arlen, M., Beilicke, W., Benbow, S. M., Bradbury, J. H., Buckley, V., Bugaev, Y., Butt, K., Byrum, A., Cannon, A., Cesarini, Y. C., Chow, L., Ciupik, P., Cogan, P., Colin, W., Cui, M. K., Daniel, R., Dickherber, C., Duke, T., Ergin, S. J., Fegan, J. P., Finley, G., Finnegan, P., Fortin, A., Furni, D., Gall, G. H., Gillander, R., Guenette, G., Gyuk, J., Grube, D., Hanna, J., Holder, D., Horan, C. M., Hui, T. B., Humensky, A., Imran, P., Kaaret, N., Karlsson, M., Kertzman, D., Kieda, J., Kildea, A., Konopelko, H., Krawczynski, F., Krennrich, M. J., Lang, S., Lebohec, G., Maier, A., Mccann, M., Mccutcheon, A., Milovanovic, P., Moriarty, T., Nagai, R. A., Ong, A. N., Otte, D., Pandel, J. S., Perkin, A., Pichel, M., Pohl, K., Ragan, L. C., Reye, P. T., Reynold, E., Roache, H. J., Rose, M., Schroedter, G. H., Sembroski, A. W., Smith, D., Steele, S. P., Swordy, M., Theiling, J. A., Toner, L., Valcarcel, A., Varlotta, S. P., Wakely, J. E., Ward, T. C., Weeke, A., Weinstein, D. A., William, S., Wissel, M., Wood, B., Zitzer, Donnarumma I, Vittorini V, Vercellone S, del Monte E, Feroci M, DAmmando F, Pacciani L, Chen A W, Tavani M, Bulgarelli A, Giuliani A, Longo F, Pucella G, Argan A, Barbiellini G, Boffelli F, Caraveo P, Cattaneo P W, Cocco V, Costa E, DeParis G, Di Cocco G, Evangelista Y, Fiorini M, Froysland T, Frutti M, Fuschino F, Galli M, Gianotti F, Labanti C, Lapshov I, Lazzarotto F, Lipari P, Marisaldi M, Mastropietro M, Mereghetti S, Morelli E, Morselli A, Pellizzoni A, Perotti F, Picozza P, Porrovecchio G, Prest M, Rapisarda M, Rappoldi A, Rubini A, Soffitta P, Trifoglio M, Trois A, Vallazza E, Zambra A, Zanello D, Pittori C, Santolamazza P, Verrecchia F, Giommi P, Colafrancesco S, Salotti L, Villata M, Raiteri C M, Chen W P, Efimova N V, Jordan B, Konstantinova T S, Koptelova E, Kurtanidze O M, Larionov V M, Ros J A, Sadun A C, Anderhub H, Antonelli L A, Antoranz P, Backes M, Baixeras C, Balestra S, Barrio J A, Bartko H, Bastieri D, González J Becerra, Becker J K, Bednarek W, Berger K, Bernardini E, Biland A, Bock R K, Bonnoli G, Bordas P, Tridon D Borla, Bosch-Ramon V, Bretz T, Britvitch I, Camara M, Carmona E, Chilingarian A, Commichau S, Contreras J L, Cortina J, Costado M T, Covino S, Curtef V, Dazzi F, DeAngelis A, DeCea del Pozo E, de los Reyes R, DeLotto B, DeMaria M, DeSabata F, Mendez C Delgado, Dominguez A, Dorner D, Doro M, Elsaesser D, Errando M, Ferenc D, Fernández E, Firpo R, Fonseca M V, Font L, Galante N, García López R J, Garczarczyk M, Gaug M, Goebel F, Hadasch D, Hayashida M, Herrero A, Höhne-Mönch D, Hose J, Hsu C C, Huber S, Jogler T, Kranich D, La Barbera A, Laille A, Leonardo E, Lindfors E, Lombardi S, López M, Lorenz E, Majumdar P, Maneva G, Mankuzhiyil N, Mannheim K, Maraschi L, Mariotti M, Martínez M, Mazin D, Meucci M, Meyer M, Miranda J M, Mirzoyan R, Moldón J, Moles M, Moralejo A, Nieto D, Nilsson K, Ninkovic J, Oya I, Paoletti R, Paredes J M, Pasanen M, Pascoli D, Pauss F, Pegna R G, Perez-Torres M A, Persic M, Peruzzo L, Prada F, Prandini E, Puchades N, Raymers A, Rhode W, Ribó M, Rico J, Rissi M, Robert A, Rügamer S, Saggion A, Saito T Y, Salvati M, Sanchez-Conde M, Sartori P, Satalecka K, Scalzotto V, Scapin V, Schweizer T, Shayduk M, Shinozaki K, Shore S N, Sidro N, Sierpowska-Bartosik A, Sillanpää A, Sitarek J, Sobczynska D, Spanier F, Stamerra A, Stark L S, Takalo L, Tavecchio F, Temnikov P, Tescaro D, Teshima M, Tluczykont M, Torres D F, Turini N, Vankov H, Venturini A, Vitale V, Wagner R M, Wittek W, Zabalza V, Zandanel F, Zanin R, Zapatero J, Acciari V, Aliu E, Arlen T, Beilicke M, Benbow W, Bradbury S M, Buckley J H, Bugaev V, Butt Y, Byrum K, Cannon A, Cesarini A, Chow Y C, Ciupik L, Cogan P, Colin P, Cui W, Daniel M K, Dickherber R, Duke C, Ergin T, Fegan S J, Finley J P, Finnegan G, Fortin P, Furniss A, Gall D, Gillanders G H, Guenette R, Gyuk G, Grube J, Hanna D, Holder J, Horan D, Hui C M, Humensky T Brian, Imran A, Kaaret P, Karlsson N, Kertzman M, Kieda D, Kildea J, Konopelko A, Krawczynski H, Krennrich F, Lang M J, LeBohec S, Maier G, McCann A, McCutcheon M, Milovanovic A, Moriarty P, Nagai T, Ong R A, Otte A N, Pandel D, Perkins J S, Pichel A, Pohl M, Ragan K, Reyes L C, Reynolds P T, Roache E, Rose H J, Schroedter M, Sembroski G H, Smith A W, Steele D, Swordy S P, Theiling M, Toner J A, Valcarcel L, Varlotta A, Wakely S P, Ward J E, Weekes T C, Weinstein A, Williams D A, Wissel S, Wood M, and Zitzer B

Subjects
campaign, Raigs còsmics, BL Lacertae: individual: Mrk421, galaxies: jets, X-Rays: Galaxies, gamma rays: observations, radiation mechanisms: nonthermal, bl-lacertae objects, blazars, Flux, Astrophysics, 01 natural sciences, 7. Clean energy, High Energy Gamma-ray Astronomy, law.invention, Raigs gamma, law, optical, MAGIC (telescope), Agile, blazr, X-ray, gamma, high energy observation, 010303 astronomy & astrophysics, webt, Physics, x-ray-spectra, Astrophysics (astro-ph), gamma-rays, lac objects, xmm-newton, Spectral energy distribution, Electrónica, Física nuclear, Raigs X, Electricidad, Flare, outburst, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, 0103 physical sciences, X-rays, BL Lacertae objects: individual (Mrk 421) – gamma rays: observations – galaxies: jets – radiation mechanisms: non-thermal – X-rays: galaxies, Blazar, Cosmic rays, 010308 nuclear & particles physics, Gamma rays, Astronomy and Astrophysics, Active Galactic Nuclei, radiation mechanisms: non-thermal, Light curve, Galaxies, Galàxies, MAGIC telescope, Space and Planetary Science, Very High Energy Gamma-ray Astronomy, ddc:520, AGILE satellite, bl lacertae objects: individual (mrk 421), Energy (signal processing), Lepton
Abstract

We present optical, X-ray, high energy ($\lessapprox 30$ GeV) and very high energy ($\gtrapprox 100$ GeV; VHE) observations of the high-frequency peaked blazar Mrk 421 taken between 2008 May 24 and June 23. A high energy $\gamma$-ray signal was detected by AGILE with \sqrt{TS}=4.5 on June 9--15, with $F(E>100 \mathrm{MeV})= 42^{+14}_{-12}\times 10^{-8}$ photons cm$^{-2}$ s$^{-1}$. This flaring state is brighter than the average flux observed by EGRET by a factor of $\sim$3, but still consistent with the highest EGRET flux. In hard X-rays (20-60 keV) SuperAGILE resolved a 5-day flare (June 9-15) peaking at $\sim$ 55 mCrab. SuperAGILE, RXTE/ASM and Swift/BAT data show a correlated flaring structure between soft and hard X-rays. Hints of the same flaring behavior are also detected in the simultaneous optical data provided by the GASP-WEBT. A Swift/XRT observation near the flaring maximum revealed the highest 2-10 keV flux ever observed from this source, of 2.6 $\times 10^{-9}$ erg cm$^{-2}$ s$^{-1}$ (i.e. > 100 mCrab). A peak synchrotron energy of $\sim$3 keV was derived, higher than typical values of $\sim$0.5-1 keV. VHE observations with MAGIC and VERITAS on June 6-8 show the flux peaking in a bright state, well correlated with the X-rays. This extraordinary set of simultaneous data, covering a twelve-decade spectral range, allowed for a deep analysis of the spectral energy distribution as well as of correlated light curves. The $\gamma$-ray flare can be interpreted within the framework of the synchrotron self-Compton model in terms of a rapid acceleration of leptons in the jet., Comment: accepted for publication in ApJL, 7 pages, 2 figures, 1 table

Published
2009
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368. Variable very-high-energy gamma-ray emission from the microquasar LS I +61 303

Author

S. Lombardi, M. Rissi, Abelardo Moralejo, C. C. Hsu, F. Pauss, D. Kranich, J. Hose, Petar Temnikov, Stefano Ciprini, K. Mannheim, M. Meyer, M. Garczarczyk, Steven N. Shore, W. Bednarek, H. Bartko, Francesco Longo, W. Wittek, A. Sillanpää, Masaaki Hayashida, Manel Errando, Jose Flix, Ll. Font, Jose Luis Contreras, Juan Abel Barrio, Michela Fagiolini, Oriana Mansutti, P. Antoranz, K. Nilsson, M. Laatiaoui, Daniel Ferenc, V. Danielyan, Michele Doro, Juan Cortina, H. Vankov, R. Orduña, P. Majumdar, V. Scapin, R. Pegna, E. Oña-Wilhelmi, Valentí Bosch-Ramon, Paula Gina Isar, M. Shayduk, David Paneque, Thomas Bretz, Josep M. Paredes, A. Raymers, D. Tescaro, Tadeusz Wibig, R. Mirzoyan, E. Lorenz, L. Peruzzo, M. Bartelt, Florian Goebel, Maria Giller, A. De Angelis, A. Piccioli, D. Hakobyan, N. Otte, B. De Lotto, S. Mizobuchi, Nicola Galante, M. Poller, B. Riegel, Wolfgang Rhode, J. Rico, E. Carmona, Francesco Dazzi, Gustavo E. Romero, N. Tonello, D. Pascoli, M. Camara, N. Pavel, K. Berger, A. Armada, R. Kosyra, Robert Wagner, D. Höhne, Marc Ribó, J. Zapatero, T. Schweizer, A. Torres, K. Mase, P. Jacon, I. Oya, M. Asensio, V. Vitale, C. Merck, R. K. Bock, I. Britvitch, G. Maneva, R. Schmitt, Dorota Sobczyńska, A. Saggion, V. Scalzotto, Justin Albert, Diego F. Torres, Ciro Bigongiari, Adrian Biland, C. Baixeras, H. Anderhub, Mario Meucci, Masahiro Teshima, Markus Gaug, K. Shinozaki, E. Aliu, Elina Lindfors, A. Laille, F. Lucarelli, Daniel Mazin, L. S. Stark, M. Pasanen, S. Rügamer, A. Robert, P. Sartori, E. Domingo-Santamaría, R. de los Reyes, M. López, T. Lenisa, Nicola Turini, M. V. Fonseca, Denis Bastieri, M. I. Martínez, S. R. Bavikadi, Alvaro Sanchez, N. Sidro, R. Zanin, T. Hengstebeck, Pol Bordas, M. Fuchs, Massimo Persic, Josue J. Lopez, J. A. Coarasa, Riccardo Paoletti, P. Liebing, Antonio Stamerra, Elisa Prandini, E. Fernandez, Ashot Chilingarian, O. Kalekin, R. Firpo, Guy G. Pooley, E. Bisesi, S. Commichau, Jose Miguel Miranda, V. Curtef, L. O. Takalo, Mosè Mariotti, Daniela Dorner, Universitat de Barcelona, Albert, J., Aliu, E., Anderhub, H., Antoranz, P., Armada, A., Asensio, M., Baixeras, C., Barrio, J. A., Bartelt, M., Bartko, H., Bastieri, D., Bavikadi, S. R., Bednarek, W., Berger, K., Bigongiari, C., Biland, A., Bisesi, E., Bock, R. K., Bordas, P., Bosch Ramon, V., Bretz, T., Britvitch, I., Camara, M., Carmona, E., Chilingarian, A., Ciprini, S., Coarasa, J. A., Commichau, S., Contreras, J. L., Cortina, J., Curtef, V., Danielyan, V., Dazzi, F., De Angelis, A., de los Reyes, R., De Lotto, B., Domingo Santamaría, E., Dorner, D., Doro, M., Errando, M., Fagiolini, M., Ferenc, D., Fernández, E., Firpo, R., Flix, J., Fonseca, M. V., Font, L., Fuchs, M., Galante, N., Garczarczyk, M., Gaug, M., Giller, M., Goebel, F., Hakobyan, D., Hayashida, M., Hengstebeck, T., Höhne, D., Hose, J., Hsu, C. C., Isar, P. G., Jacon, P., Kalekin, O., Kosyra, R., Kranich, D., Laatiaoui, M., Laille, A., Lenisa, T., Liebing, P., Lindfors, E., Lombardi, S., Longo, Francesco, López, J., López, M., Lorenz, E., Lucarelli, F., Majumdar, P., Maneva, G., Mannheim, K., Mansutti, O., Mariotti, M., Martínez, M., Mase, K., Mazin, D., Merck, C., Meucci, M., Meyer, M., Miranda, J. M., Mirzoyan, R., Mizobuchi, S., Moralejo, A., Nilsson, K., Oña Wilhelmi, E., Orduña, R., Otte, N., Oya, I., Paneque, D., Paoletti, R., Paredes, J. M., Pasanen, M., Pascoli, D., Pauss, F., Pavel, N., Pegna, R., Persic, M., Peruzzo, L., Piccioli, A., Poller, M., Pooley, G., Prandini, E., Raymers, A., Rhode, W., Ribó, M., Rico, J., Riegel, B., Rissi, M., Robert, A., Romero, G. E., Rügamer, S., Saggion, A., Sánchez, A., Sartori, P., Scalzotto, V., Scapin, V., Schmitt, R., Schweizer, T., Shayduk, M., Shinozaki, K., Shore, S. N., Sidro, N., Sillanpää, A., Sobczynska, D., Stamerra, A., Stark, L. S., Takalo, L., Temnikov, P., Tescaro, D., Teshima, M., Tonello, N., Torres, A., Torres, D. F., Turini, N., Vankov, H., Vitale, V., Wagner, R. M., Wibig, T., Wittek, W., Zanin, R., and Zapatero, J.

Subjects
Astrofísica, Ciencias Físicas, Raigs còsmics, orbital cycles, VHE Gamma ray, ATMOSPHERIC CHERENKOV TELESCOPE, Microquasar, QUASAR, Estels binaris, Astrophysics, LS I +61 303 (microcuásar), purl.org/becyt/ford/1 [https], Astrophysical jet, Microquasars, Jets (Astrofísica), Gamma ray astronomy, Radio astronomy, Absorption (electromagnetic radiation), Very High-energy Gamma-rays, Cherenkov tekescopes, Physics, Multidisciplinary, Astrophysics (astro-ph), Gamma ray, Radioastronomia, Electrónica, Física nuclear, Electricidad, CIENCIAS NATURALES Y EXACTAS, Astrophysics::High Energy Astrophysical Phenomena, Very High-energy Gamma-ray, Phase (waves), FOS: Physical sciences, microquasars, Cosmic ray, Astrophysics::Cosmology and Extragalactic Astrophysics, Binary stars, Double stars, Binary star, Astronomia de raigs gamma, Quasars, Cosmic rays, Quàsars, Astrophysics::Galaxy Astrophysics, Astronomy, Quasar, purl.org/becyt/ford/1.3 [https], gamma-ray emission, Astrophysical jets, Astronomía, Stars
Abstract

Microquasars are binary star systems with relativistic radio-emitting jets. They are potential sources of cosmic rays and can be used to elucidate the physics of relativistic jets. We report the detection of variable gamma-ray emission above 100 gigaelectron volts from the microquasar LS I 61 + 303. Six orbital cycles were recorded. Several detections occur at a similar orbital phase, which suggests that the emission is periodic. The strongest gamma-ray emission is not observed when the two stars are closest to one another, implying a strong orbital modulation of the emission or absorption processes., La lista completa de autores que integran el documento puede consultarse en el archivo., Facultad de Ciencias Astronómicas y Geofísicas, Instituto Argentino de Radioastronomía

Published
2006

369. Methods for Multidimensional Event Classification: A Case Study

Author

Bock, R.K., Chilingarian, A., Gaug, M., Hakl, František, Hengstebeck, T., Jiřina, Marcel, Klaschka, Jan, Kotrč, Emil, Savický, Petr, Towers, S., Vaicilius, A., and Wittek, W.

Subjects
comparison study, neural networks, Cherenkov telescope, multivariate classification, nearest neighbour, random forest
Published
2003

370. Observation of pulsed gamma-rays above 25 GeV from the Crab pulsar with MAGIC.

Author

Aliu E, Anderhub H, Antonelli LA, Antoranz P, Backes M, Baixeras C, Barrio JA, Bartko H, Bastieri D, Becker JK, Bednarek W, Berger K, Bernardini E, Bigongiari C, Biland A, Bock RK, Bonnoli G, Bordas P, Bosch-Ramon V, Bretz T, Britvitch I, Camara M, Carmona E, Chilingarian A, Commichau S, Contreras JL, Cortina J, Costado MT, Covino S, Curtef V, Dazzi F, De Angelis A, De Cea Del Pozo E, de Los Reyes R, De Lotto B, De Maria M, De Sabata F, Delgado Mendez C, Dominguez A, Dorner D, Doro M, Elsässer D, Errando M, Fagiolini M, Ferenc D, Fernandez E, Firpo R, Fonseca MV, Font L, Galante N, Garcia Lopez RJ, Garczarczyk M, Gaug M, Goebel F, Hadasch D, Hayashida M, Herrero A, Höhne D, Hose J, Hsu CC, Huber S, Jogler T, Kranich D, La Barbera A, Laille A, Leonardo E, Lindfors E, Lombardi S, Longo F, Lopez M, Lorenz E, Majumdar P, Maneva G, Mankuzhiyil N, Mannheim K, Maraschi L, Mariotti M, Martinez M, Mazin D, Meucci M, Meyer M, Miranda JM, Mirzoyan R, Moles M, Moralejo A, Nieto D, Nilsson K, Ninkovic J, Otte N, Oya I, Paoletti R, Paredes JM, Pasanen M, Pascoli D, Pauss F, Pegna RG, Perez-Torres MA, Persic M, Peruzzo L, Piccioli A, Prada F, Prandini E, Puchades N, Raymers A, Rhode W, Ribó M, Rico J, Rissi M, Robert A, Rügamer S, Saggion A, Saito TY, Salvati M, Sanchez-Conde M, Sartori P, Satalecka K, Scalzotto V, Scapin V, Schweizer T, Shayduk M, Shinozaki K, Shore SN, Sidro N, Sierpowska-Bartosik A, Sillanpää A, Sobczynska D, Spanier F, Stamerra A, Stark LS, Takalo L, Tavecchio F, Temnikov P, Tescaro D, Teshima M, Tluczykont M, Torres DF, Turini N, Vankov H, Venturini A, Vitale V, Wagner RM, Wittek W, Zabalza V, Zandanel F, Zanin R, Zapatero J, de Jager OC, and de Ona Wilhelmi E

Abstract

One fundamental question about pulsars concerns the mechanism of their pulsed electromagnetic emission. Measuring the high-end region of a pulsar's spectrum would shed light on this question. By developing a new electronic trigger, we lowered the threshold of the Major Atmospheric gamma-ray Imaging Cherenkov (MAGIC) telescope to 25 giga-electron volts. In this configuration, we detected pulsed gamma-rays from the Crab pulsar that were greater than 25 giga-electron volts, revealing a relatively high cutoff energy in the phase-averaged spectrum. This indicates that the emission occurs far out in the magnetosphere, hence excluding the polar-cap scenario as a possible explanation of our measurement. The high cutoff energy also challenges the slot-gap scenario.

Published
2008
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371. Very-high-energy gamma rays from a distant quasar: how transparent is the universe?

Author

Albert J, Aliu E, Anderhub H, Antonelli LA, Antoranz P, Backes M, Baixeras C, Barrio JA, Bartko H, Bastieri D, Becker JK, Bednarek W, Berger K, Bernardini E, Bigongiari C, Biland A, Bock RK, Bonnoli G, Bordas P, Bosch-Ramon V, Bretz T, Britvitch I, Camara M, Carmona E, Chilingarian A, Commichau S, Contreras JL, Cortina J, Costado MT, Covino S, Curtef V, Dazzi F, De Angelis A, De Cea Del Pozo E, de Los Reyes R, De Lotto B, De Maria M, De Sabata F, Mendez CD, Dominguez A, Dorner D, Doro M, Errando M, Fagiolini M, Ferenc D, Fernández E, Firpo R, Fonseca MV, Font L, Galante N, López RJ, Garczarczyk M, Gaug M, Goebel F, Hayashida M, Herrero A, Höhne D, Hose J, Hsu CC, Huber S, Jogler T, Kneiske TM, Kranich D, La Barbera A, Laille A, Leonardo E, Lindfors E, Lombardi S, Longo F, López M, Lorenz E, Majumdar P, Maneva G, Mankuzhiyil N, Mannheim K, Maraschi L, Mariotti M, Martínez M, Mazin D, Meucci M, Meyer M, Miranda JM, Mirzoyan R, Mizobuchi S, Moles M, Moralejo A, Nieto D, Nilsson K, Ninkovic J, Otte N, Oya I, Panniello M, Paoletti R, Paredes JM, Pasanen M, Pascoli D, Pauss F, Pegna RG, Perez-Torres MA, Persic M, Peruzzo L, Piccioli A, Prada F, Prandini E, Puchades N, Raymers A, Rhode W, Ribó M, Rico J, Rissi M, Robert A, Rügamer S, Saggion A, Saito TY, Salvati M, Sanchez-Conde M, Sartori P, Satalecka K, Scalzotto V, Scapin V, Schmitt R, Schweizer T, Shayduk M, Shinozaki K, Shore SN, Sidro N, Sierpowska-Bartosik A, Sillanpää A, Sobczynska D, Spanier F, Stamerra A, Stark LS, Takalo L, Tavecchio F, Temnikov P, Tescaro D, Teshima M, Tluczykont M, Torres DF, Turini N, Vankov H, Venturini A, Vitale V, Wagner RM, Wittek W, Zabalza V, Zandanel F, Zanin R, and Zapatero J

Abstract

The atmospheric Cherenkov gamma-ray telescope MAGIC, designed for a low-energy threshold, has detected very-high-energy gamma rays from a giant flare of the distant Quasi-Stellar Radio Source (in short: radio quasar) 3C 279, at a distance of more than 5 billion light-years (a redshift of 0.536). No quasar has been observed previously in very-high-energy gamma radiation, and this is also the most distant object detected emitting gamma rays above 50 gigaelectron volts. Because high-energy gamma rays may be stopped by interacting with the diffuse background light in the universe, the observations by MAGIC imply a low amount for such light, consistent with that known from galaxy counts.

Published
2008
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372. Variable very-high-energy gamma-ray emission from the microquasar LS I +61 303.

Author

Albert J, Aliu E, Anderhub H, Antoranz P, Armada A, Asensio M, Baixeras C, Barrio JA, Bartelt M, Bartko H, Bastieri D, Bavikadi SR, Bednarek W, Berger K, Bigongiari C, Biland A, Bisesi E, Bock RK, Bordas P, Bosch-Ramon V, Bretz T, Britvitch I, Camara M, Carmona E, Chilingarian A, Ciprini S, Coarasa JA, Commichau S, Contreras JL, Cortina J, Curtef V, Danielyan V, Dazzi F, De Angelis A, de Los Reyes R, De Lotto B, Domingo-Santamaría E, Dorner D, Doro M, Errando M, Fagiolini M, Ferenc D, Fernández E, Firpo R, Flix J, Fonseca MV, Font L, Fuchs M, Galante N, Garczarczyk M, Gaug M, Giller M, Goebel F, Hakobyan D, Hayashida M, Hengstebeck T, Höhne D, Hose J, Hsu CC, Isar PG, Jacon P, Kalekin O, Kosyra R, Kranich D, Laatiaoui M, Laille A, Lenisa T, Liebing P, Lindfors E, Lombardi S, Longo F, López J, López M, Lorenz E, Lucarelli F, Majumdar P, Maneva G, Mannheim K, Mansutti O, Mariotti M, Martínez M, Mase K, Mazin D, Merck C, Meucci M, Meyer M, Miranda JM, Mirzoyan R, Mizobuchi S, Moralejo A, Nilsson K, Oña-Wilhelmi E, Orduña R, Otte N, Oya I, Paneque D, Paoletti R, Paredes JM, Pasanen M, Pascoli D, Pauss F, Pavel N, Pegna R, Persic M, Peruzzo L, Piccioli A, Poller M, Pooley G, Prandini E, Raymers A, Rhode W, Ribó M, Rico J, Riegel B, Rissi M, Robert A, Romero GE, Rügamer S, Saggion A, Sánchez A, Sartori P, Scalzotto V, Scapin V, Schmitt R, Schweizer T, Shayduk M, Shinozaki K, Shore SN, Sidro N, Sillanpää A, Sobczynska D, Stamerra A, Stark LS, Takalo L, Temnikov P, Tescaro D, Teshima M, Tonello N, Torres A, Torres DF, Turini N, Vankov H, Vitale V, Wagner RM, Wibig T, Wittek W, Zanin R, and Zapatero J

Abstract

Microquasars are binary star systems with relativistic radio-emitting jets. They are potential sources of cosmic rays and can be used to elucidate the physics of relativistic jets. We report the detection of variable gamma-ray emission above 100 gigaelectron volts from the microquasar LS I 61 + 303. Six orbital cycles were recorded. Several detections occur at a similar orbital phase, which suggests that the emission is periodic. The strongest gamma-ray emission is not observed when the two stars are closest to one another, implying a strong orbital modulation of the emission or absorption processes.

Published
2006
Full Text
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