Very high-energyγ-ray observations of novae and dwarf novae with the MAGIC telescopes

/ Authors

M. L. Ahnen, S. Ansoldi, L. A. Antonelli, P. Antoranz, A. Babić, B. Banerjee, P. Bangale, U. D. Almeida, J. Barrio, J. Gonz'alez

and 251 more authors

W. Bednarek, E. Bernardini, B. Biasuzzi, A. Biland, O. Blanch, S. Bonnefoy, G. Bonnoli, F. Borracci, T. Bretz, E. Carmona, A. Carosi, A. Chatterjee, R. Clavero, P. Colin, E. Colombo, J. Contreras, J. Cortina, S. Covino, P. D. Vela, F. Dazzi, A. Angelis, G. Caneva, B. Lotto, E. O. Wilhelmi, C. Mendez, F. Pierro, D. Prester, D. Dorner, M. Doro, S. Einecke, D. Glawion, D. Elsaesser, A. Fern'andez-Barral, D. Fidalgo, M. Fonseca, L. Font, K. Frantzen, C. Fruck, D. Galindo, R. L'opez, M. Garczarczyk, D. G. Terrats, M. Gaug, P. Giammaria, N. Godinovi'c, A. G. Muñoz, D. Guberman, Y. Hanabata, M. Hayashida, J. Herrera, J. Hose, D. Hrupec, G. Hughes, W. Idec, H. Kellermann, K. Kodani, Y. Konno, H. Kubo, J. Kushida, A. Barbera, D. Lelas, N. Lewandowska, E. Lindfors, S. Lombardi, F. Longo, M. L'opez, R. L'opez-Coto, A. L'opez-Oramas, E. Lorenz, P. Majumdar, M. Makariev, K. Mallot, G. Maneva, M. Manganaro, K. Mannheim, L. Maraschi, B. Marcote, M. Mariotti, M. Mart'inez, D. Mazin, U. Menzel, J. Miranda, R. Mirzoyan, A. Moralejo, D. Nakajima, V. Neustroev, A. Niedźwiecki, M. Rosillo, K. Nilsson, K. Nishijima, K. Noda, R. Orito, A. Overkemping, S. Paiano, J. Palacio, M. Palatiello, D. Paneque, R. Paoletti, J. Paredes, X. Paredes-Fortuny, M. Persic, J. Poutanen, P. Moroni, E. Prandini, I. Puljak, R. Reinthal, W. Rhode, M. Rib'o, J. Rico, J. Garcia, T. Saito, K. Saito, K. Satalecka, V. Scapin, C. Schultz, T. Schweizer, A. Sillanpaa, J. Sitarek, I. Šnidarić, D. Sobczynska, A. Stamerra, T. Steinbring, M. Strzys, L. Takalo, H. Takami, F. Tavecchio, P. Temnikov, T. Terzi'c, D. Tescaro, M. Teshima, J. Thaele, D. Torres, T. Toyama, A. Treves, V. Verguilov, I. Vovk, M. Will, R. Zanin, R. Desiante, E. Zurich, CH-8093 Zurich, Switzerland., U. Udine, I. Trieste, I. Udine, Italy., I. I. F. Astrophysics, I-00136 Rome, U. Siena, I. Pisa, I-53100 Siena, Croatian Magic Consortium, Rudjer Boskovic Institute, University of Rijeka, University of Split, HR-10000 Zagreb, Croatia., S. S. I. O. Physics, 1. Bidhannagar, Salt Lake, Sector-1, Kolkata 700064, India., M. F. Physik, D-80805 Munchen, H Germany, U. Complutense, E. Madrid, Spain., Instituto de Astrof'isica de Canarias, E. Laguna, Tenerife, University of L'od'z, PL-90236 Lodz, Poland, D. Elektronen-Synchrotron, D. Zeuthen, Ifae, Campus Uab, E-08193 Bellaterra, U. Wurzburg, D-97074 Wurzburg, Centro de Investigaciones Energ'eticas, Medioambientales y Tecnol'ogicas, U. Padova, Infn, I-35131 Padova, Institute for Space Sciences, E. Barcelona, Technische Universitat Dortmund, D. Dortmund, Unitat de F'isica de les Radiacions, Departament de F'isica, CERES-IEEC, U. Barcelona, U. Barcelona, Icc, IEEC-UB, E. Barcelona, Japanese Magic Consortium, Icrr, T. U. O. Tokyo, D. Physics, Hakubi Center, Kyoto University, T. University, The University of Tokushima, Kek, Japan., Finnish Magic Consortium, T. Observatory, U. Turku, U. Oulu, Finland., Inst. for Nucl. Research, Nucl. Energy, BG-1784 Sofia, Bulgaria., U. Pisa, I. Pisa, Icrea, U. dell'Insubria, I. M. Bicocca, Como, I-22100 Como, Now at Centro Brasileiro de Pesquisas F'isicas, R. Sigaud, 150-Urca, RJ RiodeJaneiro-, 22290-180, Brazil, now at Nasa Goddard Space Flight Center, Greenbelt, MD 20771, Usa, D. O. Astronomy, U. Maryland, College Park, MD 20742, H. Berlin, 15 InstitutfurPhysikNewtonstr., 12489 Berlin Germany, N. C. E. P. F. D. Lausanne, Lausanne, N. Eso, Turku, also at INAF-Trieste, A. M. C. F. Astrophysics, 1290, Versoix, N. J. S. Center

/ Abstract

Context. In the last five years the Fermi Large Area Telescope (LAT) instrument detected GeV-ray emission from five novae. The GeV emission can be interpreted in terms of an inverse Compton process of electrons accelerated in a shock. In this case it is expected that protons in the same conditions can be accelerated to much higher energies. Consequently they may produce a second component in the -ray spectrum at TeV energies. Aims. We aim to explore the very-high-energy domain to search for-ray emission above 50 GeV and to shed light on the acceleration process of leptons and hadrons in nova explosions. Methods. We have performed observations with the MAGIC telescopes of the classical nova V339 Del shortly after the 2013 outburst, triggered by optical and subsequent GeV -ray detections. We also briefly report on VHE observations of the symbiotic nova YY Her and the dwarf nova ASASSN-13ax. We complement the TeV MAGIC o bservations with the analysis of contemporaneous Fermi-LAT data of the sources. The TeV and GeV observations are compared in order to evaluate the acceleration parameters for lepto ns and hadrons. Results. No significant TeV emission was found from the studied source s. We computed upper limits on the spectrum and night-bynight flux. The combined GeV and TeV observations of V339 Del limit the ratio of proton to electron luminosities to Lp. 0.15 Le.

Journal: Astronomy & Astrophysics

DOI: 10.1051/0004-6361/201526478