Search

Your search keyword '"De Oña Wilhelmi, E."' showing total 14 results
Start Over Author "De Oña Wilhelmi, E." Journal monthly notices of the royal astronomical society
14 results on '"De Oña Wilhelmi, E."'

2. Very high energy γ-ray emission from two blazars of unknown redshift and upper limits on their distance

Author

Abdalla, H, primary, Adam, R, primary, Aharonian, F, primary, Ait Benkhali, F, primary, Angüner, E O, primary, Arakawa, M, primary, Arcaro, C, primary, Armand, C, primary, Armstrong, T, primary, Ashkar, H, primary, Backes, M, primary, Baghmanyan, V, primary, Barbosa Martins, V, primary, Barnacka, A, primary, Barnard, M, primary, Becherini, Y, primary, Berge, D, primary, Bernlöhr, K, primary, Böttcher, M, primary, Boisson, C, primary, Bolmont, J, primary, Bonnefoy, S, primary, Bregeon, J, primary, Breuhaus, M, primary, Brun, F, primary, Brun, P, primary, Bryan, M, primary, Büchele, M, primary, Bulik, T, primary, Bylund, T, primary, Caroff, S, primary, Carosi, A, primary, Casanova, S, primary, Chand, T, primary, Chandra, S, primary, Chen, A, primary, Cotter, G, primary, Curyło, M, primary, Davids, I D, primary, Davies, J, primary, Deil, C, primary, Devin, J, primary, deWilt, P, primary, Dirson, L, primary, Djannati-Ataï, A, primary, Dmytriiev, A, primary, Donath, A, primary, Doroshenko, V, primary, Dyks, J, primary, Egberts, K, primary, Eichhorn, F, primary, Emery, G, primary, Ernenwein, J -P, primary, Feijen, K, primary, Fegan, S, primary, Fiasson, A, primary, Fontaine, G, primary, Funk, S, primary, Füßling, M, primary, Gabici, S, primary, Gallant, Y A, primary, Giavitto, G, primary, Giunti, L, primary, Glawion, D, primary, Glicenstein, J F, primary, Gottschall, D, primary, Grondin, M -H, primary, Hahn, J, primary, Haupt, M, primary, Hermann, G, primary, Hinton, J A, primary, Hofmann, W, primary, Hoischen, C, primary, Holch, T L, primary, Holler, M, primary, Hörbe, M, primary, Horns, D, primary, Huber, D, primary, Iwasaki, H, primary, Jamrozy, M, primary, Jankowsky, D, primary, Jankowsky, F, primary, Jardin-Blicq, A, primary, Joshi, V, primary, Jung-Richardt, I, primary, Kastendieck, M A, primary, Katarzyński, K, primary, Katsuragawa, M, primary, Katz, U, primary, Khangulyan, D, primary, Khélifi, B, primary, Klepser, S, primary, Kluźniak, W, primary, Komin, Nu, primary, Konno, R, primary, Kosack, K, primary, Kostunin, D, primary, Kreter, M, primary, Lamanna, G, primary, Lemière, A, primary, Lemoine-Goumard, M, primary, Lenain, J -P, primary, Leser, E, primary, Levy, C, primary, Lohse, T, primary, Lypova, I, primary, Mackey, J, primary, Majumdar, J, primary, Malyshev, D, primary, Marandon, V, primary, Marchegiani, P, primary, Marcowith, A, primary, Mares, A, primary, Martí-Devesa, G, primary, Marx, R, primary, Maurin, G, primary, Meintjes, P J, primary, Moderski, R, primary, Mohamed, M, primary, Mohrmann, L, primary, Moore, C, primary, Morris, P, primary, Moulin, E, primary, Muller, J, primary, Murach, T, primary, Nakashima, S, primary, Nakashima, K, primary, de Naurois, M, primary, Ndiyavala, H, primary, Niederwanger, F, primary, Niemiec, J, primary, Oakes, L, primary, O’Brien, P, primary, Odaka, H, primary, Ohm, S, primary, de Oña Wilhelmi, E, primary, Ostrowski, M, primary, Panter, M, primary, Parsons, R D, primary, Peyaud, B, primary, Piel, Q, primary, Pita, S, primary, Poireau, V, primary, Noel, A P, primary, Prokhorov, D A, primary, Prokoph, H, primary, Pühlhofer, G, primary, Punch, M, primary, Quirrenbach, A, primary, Raab, S, primary, Rauth, R, primary, Reimer, A, primary, Reimer, O, primary, Remy, Q, primary, Renaud, M, primary, Rieger, F, primary, Rinchiuso, L, primary, Romoli, C, primary, Rowell, G, primary, Rudak, B, primary, Ruiz-Velasco, E, primary, Sahakian, V, primary, Sailer, S, primary, Saito, S, primary, Sanchez, D A, primary, Santangelo, A, primary, Sasaki, M, primary, Scalici, M, primary, Schüssler, F, primary, Schutte, H M, primary, Schwanke, U, primary, Schwemmer, S, primary, Seglar-Arroyo, M, primary, Senniappan, M, primary, Seyffert, A S, primary, Shafi, N, primary, Shiningayamwe, K, primary, Simoni, R, primary, Sinha, A, primary, Sol, H, primary, Specovius, A, primary, Spencer, S, primary, Spir-Jacob, M, primary, Stawarz, Ł, primary, Steenkamp, R, primary, Stegmann, C, primary, Steppa, C, primary, Takahashi, T, primary, Tavernier, T, primary, Taylor, A M, primary, Terrier, R, primary, Tiziani, D, primary, Tluczykont, M, primary, Tomankova, L, primary, Trichard, C, primary, Tsirou, M, primary, Tsuji, N, primary, Tuffs, R, primary, Uchiyama, Y, primary, van der Walt, D J, primary, van Eldik, C, primary, van Rensburg, C, primary, van Soelen, B, primary, Vasileiadis, G, primary, Veh, J, primary, Venter, C, primary, Vincent, P, primary, Vink, J, primary, Völk, H J, primary, Vuillaume, T, primary, Wadiasingh, Z, primary, Wagner, S J, primary, Watson, J, primary, Werner, F, primary, White, R, primary, Wierzcholska, A, primary, Yang, R, primary, Yoneda, H, primary, Zacharias, M, primary, Zanin, R, primary, Zargaryan, D, primary, Zdziarski, A A, primary, Zech, A, primary, Zhu, S J, primary, Zorn, J, primary, Żywucka, N, primary, and Cerruti, M, primary

Published
2020
Full Text
View/download PDF

4. The Crab nebula variability at short time-scales with the Cherenkov telescope array.

Author

Mestre, E, de Oña Wilhelmi, E, Khangulyan, D, Zanin, R, Acero, F, and Torres, D F

Subjects
*CRAB Nebula, *SPECTRAL energy distribution, *SOLAR flares, *NEBULAE, *TELESCOPES, *THRESHOLD energy, *DATA recorders & recording
Abstract

Since 2009, several rapid and bright flares have been observed at high energies (>100 MeV) from the direction of the Crab nebula. Several hypotheses have been put forward to explain this phenomenon, but the origin is still unclear. The detection of counterparts at higher energies with the next generation of Cherenkov telescopes will be determinant to constrain the underlying emission mechanisms. We aim at studying the capability of the Cherenkov Telescope Array (CTA) to explore the physics behind the flares, by performing simulations of the Crab nebula spectral energy distribution, both in flaring and steady state, for different parameters related to the physical conditions in the nebula. In particular, we explore the data recorded by Fermi during two particular flares that occurred in 2011 and 2013. The expected GeV and TeV gamma-ray emission is derived using different radiation models. The resulting emission is convoluted with the CTA response and tested for detection, obtaining an exclusion region for the space of parameters that rule the different flare emission models. Our simulations show different scenarios that may be favourable for achieving the detection of the flares in Crab with CTA, in different regimes of energy. In particular, we find that observations with low sub-100 GeV energy threshold telescopes could provide the most model-constraining results. [ABSTRACT FROM AUTHOR]

Published
2021
Full Text
View/download PDF

5. Prospects for the characterization of the VHE emission from the Crab nebula and pulsar with the Cherenkov Telescope Array.

Author

Mestre, E, de Oña Wilhelmi, E, Zanin, R, Torres, D F, and Tibaldo, L

Subjects
*CRAB Nebula, *PULSARS, *TELESCOPES, *LIGHT curves, *ASTROPHYSICS, *GAMMA ray astronomy, *PLANETARY nebulae
Abstract

The Cherenkov Telescope Array (CTA) will be the next generation instrument for the very high energy gamma-ray astrophysics domain. With its enhanced sensitivity in comparison with the current facilities, CTA is expected to shed light on a varied population of sources. In particular, we will achieve a deeper knowledge of the Crab nebula and pulsar, which are the best characterized pulsar wind nebula and rotation powered pulsar, respectively. We aim at studying the capabilities of CTA regarding these objects through simulations, using the main tools currently in development for the CTA future data analysis: gammapy and ctools. We conclude that, even using conservative Instrument Response Functions, CTA will be able to resolve many uncertainties regarding the spectrum and morphology of the pulsar and its nebula. The large energy range covered by CTA will allow us to disentangle the nebula spectral shape among different hypotheses, corresponding to different underlying emitting mechanisms. In addition, resolving internal structures (smaller than ∼0.02° in size) in the nebula and unveiling their location, would provide crucial information about the propagation of particles in the magnetized medium. We used a theoretical asymmetric model to characterize the morphology of the nebula and we showed that if predictions of such morphology exist, for instance as a result of hydrodynamical or magneto-hydrodynamical simulations, it can be directly compared with CTA results. We also tested the capability of CTA to detect periodic radiation from the Crab pulsar obtaining a precise measurement of different light curves shapes. [ABSTRACT FROM AUTHOR]

Published
2020
Full Text
View/download PDF

7. Erratum: A cut-off in the TeV gamma-ray spectrum of the SNR Cassiopeia A

Author

Ahnen, MAGIC Collaboration: M L, primary, Ansoldi, S, additional, Antonelli, L A, additional, Arcaro, C, additional, Babić, A, additional, Banerjee, B, additional, Bangale, P, additional, de Almeida, U Barres, additional, Barrio, J A, additional, González, J Becerra, additional, Bednarek, W, additional, Bernardini, E, additional, Berti, A, additional, Bhattacharyya, W, additional, Biasuzzi, B, additional, Biland, A, additional, Blanch, O, additional, Bonnefoy, S, additional, Bonnoli, G, additional, Carosi, R, additional, Carosi, A, additional, Chatterjee, A, additional, Colak, M, additional, Colin, P, additional, Colombo, E, additional, Contreras, J L, additional, Cortina, J, additional, Covino, S, additional, Cumani, P, additional, Da Vela, P, additional, Dazzi, F, additional, De Angelis, A, additional, De Lotto, B, additional, de Oña Wilhelmi, E, additional, Pierro, F Di, additional, Doert, M, additional, Domínguez, A, additional, Prester, D Dominis, additional, Dorner, D, additional, Doro, M, additional, Einecke, S, additional, Glawion, D Eisenacher, additional, Elsaesser, D, additional, Engelkemeier, M, additional, Ramazani, V Fallah, additional, Fernández-Barral, A, additional, Fidalgo, D, additional, Fonseca, M V, additional, Font, L, additional, Fruck, C, additional, Galindo, D, additional, López, R J García, additional, Garczarczyk, M, additional, Gaug, M, additional, Giammaria, P, additional, Godinović, N, additional, Gora, D, additional, Guberman, D, additional, Hadasch, D, additional, Hahn, A, additional, Hassan, T, additional, Hayashida, M, additional, Herrera, J, additional, Hose, J, additional, Hrupec, D, additional, Inada, T, additional, Ishio, K, additional, Konno, Y, additional, Kubo, H, additional, Kushida, J, additional, Kuveždić, D, additional, Lelas, D, additional, Lindfors, E, additional, Lombardi, S, additional, Longo, F, additional, López, M, additional, Maggio, C, additional, Majumdar, P, additional, Makariev, M, additional, Maneva, G, additional, Manganaro, M, additional, Mannheim, K, additional, Maraschi, L, additional, Mariotti, M, additional, Martínez, M, additional, Mazin, D, additional, Menzel, U, additional, Minev, M, additional, Mirzoyan, R, additional, Moralejo, A, additional, Moreno, V, additional, Moretti, E, additional, Neustroev, V, additional, Niedzwiecki, A, additional, Rosillo, M Nievas, additional, Nilsson, K, additional, Ninci, D, additional, Nishijima, K, additional, Noda, K, additional, Nogués, L, additional, Paiano, S, additional, Palacio, J, additional, Paneque, D, additional, Paoletti, R, additional, Paredes, J M, additional, Pedaletti, G, additional, Peresano, M, additional, Perri, L, additional, Persic, M, additional, Moroni, P G Prada, additional, Prandini, E, additional, Puljak, I, additional, Garcia, J R, additional, Reichardt, I, additional, Rhode, W, additional, Ribó, M, additional, Rico, J, additional, Righi, C, additional, Saito, T, additional, Satalecka, K, additional, Schroeder, S, additional, Schweizer, T, additional, Shore, S N, additional, Sitarek, J, additional, Šnidarić, I, additional, Sobczynska, D, additional, Stamerra, A, additional, Strzys, M, additional, Surić, T, additional, Takalo, L, additional, Tavecchio, F, additional, Temnikov, P, additional, Terzić, T, additional, Tescaro, D, additional, Teshima, M, additional, Torres, D F, additional, Torres-Albà, N, additional, Treves, A, additional, Vanzo, G, additional, Acosta, M Vazquez, additional, Vovk, I, additional, Ward, J E, additional, Will, M, additional, and Zarić, D, additional

Published
2018
Full Text
View/download PDF

8. A cut-off in the TeV gamma-ray spectrum of the SNR Cassiopeia A

Author

Ahnen, M. L., primary, Ansoldi, S., additional, Antonelli, L. A., additional, Arcaro, C., additional, Babić, A., additional, Banerjee, B., additional, Bangale, P., additional, Barres de Almeida, U., additional, Barrio, J. A., additional, Becerra González, J., additional, Bednarek, W., additional, Bernardini, E., additional, Berti, A., additional, Bhattacharyya, W., additional, Biasuzzi, B., additional, Biland, A., additional, Blanch, O., additional, Bonnefoy, S., additional, Bonnoli, G., additional, Carosi, R., additional, Carosi, A., additional, Chatterjee, A., additional, Colak, M., additional, Colin, P., additional, Colombo, E., additional, Contreras, J. L., additional, Cortina, J., additional, Covino, S., additional, Cumani, P., additional, Da Vela, P., additional, Dazzi, F., additional, De Angelis, A., additional, De Lotto, B., additional, de Oña Wilhelmi, E., additional, Di Pierro, F., additional, Doert, M., additional, Domínguez, A., additional, Dominis Prester, D., additional, Dorner, D., additional, Doro, M., additional, Einecke, S., additional, Eisenacher Glawion, D., additional, Elsaesser, D., additional, Engelkemeier, M., additional, Fallah Ramazani, V., additional, Fernández-Barral, A., additional, Fidalgo, D., additional, Fonseca, M. V., additional, Font, L., additional, Fruck, C., additional, Galindo, D., additional, García López, R. J., additional, Garczarczyk, M., additional, Gaug, M., additional, Giammaria, P., additional, Godinović, N., additional, Gora, D., additional, Guberman, D., additional, Hadasch, D., additional, Hahn, A., additional, Hassan, T., additional, Hayashida, M., additional, Herrera, J., additional, Hose, J., additional, Hrupec, D., additional, Inada, T., additional, Ishio, K., additional, Konno, Y., additional, Kubo, H., additional, Kushida, J., additional, Kuveždić, D., additional, Lelas, D., additional, Lindfors, E., additional, Lombardi, S., additional, Longo, F., additional, López, M., additional, Maggio, C., additional, Majumdar, P., additional, Makariev, M., additional, Maneva, G., additional, Manganaro, M., additional, Mannheim, K., additional, Maraschi, L., additional, Mariotti, M., additional, Martínez, M., additional, Mazin, D., additional, Menzel, U., additional, Minev, M., additional, Mirzoyan, R., additional, Moralejo, A., additional, Moreno, V., additional, Moretti, E., additional, Neustroev, V., additional, Niedzwiecki, A., additional, Nievas Rosillo, M., additional, Nilsson, K., additional, Ninci, D., additional, Nishijima, K., additional, Noda, K., additional, Nogués, L., additional, Paiano, S., additional, Palacio, J., additional, Paneque, D., additional, Paoletti, R., additional, Paredes, J. M., additional, Pedaletti, G., additional, Peresano, M., additional, Perri, L., additional, Persic, M., additional, Prada Moroni, P. G., additional, Prandini, E., additional, Puljak, I., additional, Garcia, J. R., additional, Reichardt, I., additional, Rhode, W., additional, Ribó, M., additional, Rico, J., additional, Righi, C., additional, Saito, T., additional, Satalecka, K., additional, Schroeder, S., additional, Schweizer, T., additional, Shore, S. N., additional, Sitarek, J., additional, Šnidarić, I., additional, Sobczynska, D., additional, Stamerra, A., additional, Strzys, M., additional, Surić, T., additional, Takalo, L., additional, Tavecchio, F., additional, Temnikov, P., additional, Terzić, T., additional, Tescaro, D., additional, Teshima, M., additional, Torres-Albà, N., additional, Treves, A., additional, Vanzo, G., additional, Vazquez Acosta, M., additional, Vovk, I., additional, Ward, J. E., additional, Will, M., additional, and Zarić, D., additional

Published
2017
Full Text
View/download PDF

9. MAGIC observations of the microquasar V404 Cygni during the 2015 outburst

Author

Ahnen, M. L., primary, Ansoldi, S., additional, Antonelli, L. A., additional, Arcaro, C., additional, Babić, A., additional, Banerjee, B., additional, Bangale, P., additional, Barres de Almeida, U., additional, Barrio, J. A., additional, Becerra González, J., additional, Bednarek, W., additional, Bernardini, E., additional, Berti, A., additional, Biasuzzi, B., additional, Biland, A., additional, Blanch, O., additional, Bonnefoy, S., additional, Bonnoli, G., additional, Carosi, R., additional, Carosi, A., additional, Chatterjee, A., additional, Colin, P., additional, Colombo, E., additional, Contreras, J. L., additional, Cortina, J., additional, Covino, S., additional, Cumani, P., additional, Da Vela, P., additional, Dazzi, F., additional, De Angelis, A., additional, De Lotto, B., additional, de Oña Wilhelmi, E., additional, Di Pierro, F., additional, Doert, M., additional, Domínguez, A., additional, Dominis Prester, D., additional, Dorner, D., additional, Doro, M., additional, Einecke, S., additional, Eisenacher Glawion, D., additional, Elsaesser, D., additional, Engelkemeier, M., additional, Fallah Ramazani, V., additional, Fernández-Barral, A., additional, Fidalgo, D., additional, Fonseca, M. V., additional, Font, L., additional, Fruck, C., additional, Galindo, D., additional, García López, R. J., additional, Garczarczyk, M., additional, Gaug, M., additional, Giammaria, P., additional, Godinović, N., additional, Gora, D., additional, Griffiths, S., additional, Guberman, D., additional, Hadasch, D., additional, Hahn, A., additional, Hassan, T., additional, Hayashida, M., additional, Herrera, J., additional, Hose, J., additional, Hrupec, D., additional, Hughes, G., additional, Ishio, K., additional, Konno, Y., additional, Kubo, H., additional, Kushida, J., additional, Kuveždić, D., additional, Lelas, D., additional, Lindfors, E., additional, Lombardi, S., additional, Longo, F., additional, López, M., additional, Maggio, C., additional, Majumdar, P., additional, Makariev, M., additional, Maneva, G., additional, Manganaro, M., additional, Mannheim, K., additional, Maraschi, L., additional, Mariotti, M., additional, Martínez, M., additional, Mazin, D., additional, Menzel, U., additional, Minev, M., additional, Mirzoyan, R., additional, Moralejo, A., additional, Moreno, V., additional, Moretti, E., additional, Neustroev, V., additional, Niedzwiecki, A., additional, Nievas Rosillo, M., additional, Nilsson, K., additional, Ninci, D., additional, Nishijima, K., additional, Noda, K., additional, Nogués, L., additional, Paiano, S., additional, Palacio, J., additional, Paneque, D., additional, Paoletti, R., additional, Paredes, J. M., additional, Paredes-Fortuny, X., additional, Pedaletti, G., additional, Peresano, M., additional, Perri, L., additional, Persic, M., additional, Prada Moroni, P. G., additional, Prandini, E., additional, Puljak, I., additional, Garcia, J. R., additional, Reichardt, I., additional, Rhode, W., additional, Ribó, M., additional, Rico, J., additional, Saito, T., additional, Satalecka, K., additional, Schroeder, S., additional, Schweizer, T., additional, Sillanpää, A., additional, Sitarek, J., additional, Šnidarić, I., additional, Sobczynska, D., additional, Stamerra, A., additional, Strzys, M., additional, Surić, T., additional, Takalo, L., additional, Tavecchio, F., additional, Temnikov, P., additional, Terzić, T., additional, Tescaro, D., additional, Teshima, M., additional, Torres, D. F., additional, Torres-Albà, N., additional, Treves, A., additional, Vanzo, G., additional, Vazquez Acosta, M., additional, Vovk, I., additional, Ward, J. E., additional, Will, M., additional, Zarić, D., additional, Collaboration), (The MAGIC, additional, Loh, A., additional, and Rodriguez, J., additional

Published
2017
Full Text
View/download PDF

12. MAGIC detection of short-term variability of the high-peaked BL Lac object 1ES 0806+524

Author

Aleksić, J., primary, Ansoldi, S., additional, Antonelli, L. A., additional, Antoranz, P., additional, Babic, A., additional, Bangale, P., additional, Barrio, J. A., additional, Becerra González, J., additional, Bednarek, W., additional, Bernardini, E., additional, Biasuzzi, B., additional, Biland, A., additional, Blanch, O., additional, Bonnefoy, S., additional, Bonnoli, G., additional, Borracci, F., additional, Bretz, T., additional, Carmona, E., additional, Carosi, A., additional, Colin, P., additional, Colombo, E., additional, Contreras, J. L., additional, Cortina, J., additional, Covino, S., additional, Da Vela, P., additional, Dazzi, F., additional, De Angelis, A., additional, De Caneva, G., additional, De Lotto, B., additional, de Oña Wilhelmi, E., additional, Delgado Mendez, C., additional, Di Pierro, F., additional, Dominis Prester, D., additional, Dorner, D., additional, Doro, M., additional, Einecke, S., additional, Eisenacher, D., additional, Elsaesser, D., additional, Fernández-Barral, A., additional, Fidalgo, D., additional, Fonseca, M. V., additional, Font, L., additional, Frantzen, K., additional, Fruck, C., additional, Galindo, D., additional, García López, R. J., additional, Garczarczyk, M., additional, Garrido Terrats, D., additional, Gaug, M., additional, Godinović, N., additional, González Muñoz, A., additional, Gozzini, S. R., additional, Hadasch, D., additional, Hanabata, Y., additional, Hayashida, M., additional, Herrera, J., additional, Hose, J., additional, Hrupec, D., additional, Idec, W., additional, Kadenius, V., additional, Kellermann, H., additional, Knoetig, M. L., additional, Kodani, K., additional, Konno, Y., additional, Krause, J., additional, Kubo, H., additional, Kushida, J., additional, La Barbera, A., additional, Lelas, D., additional, Lewandowska, N., additional, Lindfors, E., additional, Lombardi, S., additional, Longo, F., additional, López, M., additional, López-Coto, R., additional, López-Oramas, A., additional, Lorenz, E., additional, Lozano, I., additional, Makariev, M., additional, Mallot, K., additional, Maneva, G., additional, Mannheim, K., additional, Maraschi, L., additional, Marcote, B., additional, Mariotti, M., additional, Martínez, M., additional, Mazin, D., additional, Menzel, U., additional, Miranda, J. M., additional, Mirzoyan, R., additional, Moralejo, A., additional, Munar-Adrover, P., additional, Nakajima, D., additional, Neustroev, V., additional, Niedzwiecki, A., additional, Nievas Rosillo, M., additional, Nilsson, K., additional, Nishijima, K., additional, Noda, K., additional, Orito, R., additional, Overkemping, A., additional, Paiano, S., additional, Palatiello, M., additional, Paneque, D., additional, Paoletti, R., additional, Paredes, J. M., additional, Paredes-Fortuny, X., additional, Persic, M., additional, Poutanen, J., additional, Prada Moroni, P. G., additional, Prandini, E., additional, Puljak, I., additional, Reinthal, R., additional, Rhode, W., additional, Ribó, M., additional, Rico, J., additional, Rodriguez Garcia, J., additional, Saito, T., additional, Saito, K., additional, Satalecka, K., additional, Scalzotto, V., additional, Scapin, V., additional, Schultz, C., additional, Schweizer, T., additional, Shore, S. N., additional, Sillanpää, A., additional, Sitarek, J., additional, Snidaric, I., additional, Sobczynska, D., additional, Stamerra, A., additional, Steinbring, T., additional, Strzys, M., additional, Takalo, L., additional, Takami, H., additional, Tavecchio, F., additional, Temnikov, P., additional, Terzić, T., additional, Tescaro, D., additional, Teshima, M., additional, Thaele, J., additional, Torres, D. F., additional, Toyama, T., additional, Treves, A., additional, Vogler, P., additional, Will, M., additional, Zanin, R., additional, Berger, K., additional, Buson, S., additional, D'Ammando, F., additional, Gasparrini, D., additional, Hovatta, T., additional, Max-Moerbeck, W., additional, Readhead, A., additional, and Richards, J., additional

Published
2015
Full Text
View/download PDF

13. Multiband study of RX J0838-2827 and XMM J083850.4-282759: a new asynchronous magnetic cataclysmic variable and a candidate transitional millisecond pulsar.

Author

Rea, N., Coti Zelati, F., Esposito, P., D'Avanzo, P., de Martino, D., Israel, G. L., Torres, D. F., Campana, S., Belloni, T. M., Papitto, A., Masetti, N., Carrasco, L., Possenti, A., Wieringa, M., De Oña Wilhelmi, E., Li, J., Bozzo, E., Ferrigno, C., Linares, M., and Tauris, T. M.

Subjects
CATACLYSMIC variable stars, PULSARS, ACCRETION (Astrophysics), X-ray emission spectroscopy, WHITE dwarf stars
Abstract

In a search for the counterpart to the Fermi-LAT source 3FGL J0838.8-2829, we performed a multiwavelength campaign: in the X-ray band with Swift and XMM–Newton; in the infrared and optical with OAGH, ESO-NTT and IAC80; and in the radio with ATCA observations. We also used archival hard X-ray data obtained by INTEGRAL. We report on three X-ray sources consistent with the position of the Fermi-LAT source. We confirm the identification of the brightest object, RX J0838-2827, as a magnetic cataclysmic variable that we recognize as an asynchronous system (not associated with the Fermi-LAT source). RX J0838-2827 is extremely variable in the X-ray and optical bands, and timing analysis reveals the presence of several periodicities modulating its X-ray and optical emission. The most evident modulations are interpreted as being caused by the binary system orbital period of ∼1.64 h and the white dwarf spin period of ∼1.47 h. A strong flux modulation at ∼15 h is observed at all energy bands, consistent with the beat frequency between spin and orbital periods. Optical spectra show prominent Hβ, He I and He II emission lines that are Doppler-modulated at the orbital period and at the beat period. Therefore, RX J0838-2827 accretes through a disc-less configuration and could be either a strongly asynchronous polar or a rare example of a pre-polar system on its way to reaching synchronism. Regarding the other two X-ray sources, XMM J083850.4-282759 showed a variable X-ray emission, with a powerful flare lasting for ∼600 s, similar to what is observed in transitional millisecond pulsars during the subluminous disc state: this observation possibly means that this source can be associated with the Fermi-LAT source. [ABSTRACT FROM AUTHOR]

Published
2017
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results