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

Ahnen, M. L; Ansoldi, S.; Antonelli, L. A.; Antoranz, P.; Babic, A.; Banerjee, B.; Bangale, P.; Barres De Almeida, U.; Barrio, J. A.; Becerra González, J.; Bednarek, W.; Bernardini, E.; Biasuzzi, B.; Biland, A.; Blanch, O.; Bonnefoy, S.; Bonnoli, G.; Borracci, F.; Bretz, T.; Carmona, E.; Carosi, A.; Chatterjee, A.; Clavero, R.; Colin, P.; Colombo, E.; Contreras, J. L.; Cortina, J.; Covino, S.; Da Vela, P.; Dazzi, F.; De Angelis, A.; De Caneva, G.; De Lotto, B.; De Oña Wilhelmi, E.; Delgado Mendez, C.; Di Pierro, F.; Dominis Prester, D.; Dorner, D.; Doro, M.; Einecke, S.; Eisenacher Glawion, D.; Elsaesser, D.; Fernández Barral, A.; Fidalgo, D.; Fonseca, M. V.; Font, L.; Frantzen, K.; Fruck, C.; Galindo, D.; García López, R. J.; Garczarczyk, M.; Garrido Terrats, D.; Gaug, M.; Giammaria, P.; Godinović, N.; González Muñoz, A.; Guberman, D.; Hanabata, Y.; Hayashida, M.; Herrera, J.; Hose, J.; Hrupec, D.; Hughes, G.; Idec, W.; Kellermann, H.; Kodani, K.; Konno, Y.; Kubo, H.; Kushida, J.; La Barbera, A.; Lelas, D.; Lewandowska, N.; Lindfors, E.; Lombardi, S.; Longo, Francesco; López, M.; López Coto, R.; López Oramas, A.; Lorenz, E.; Majumdar, P.; Makariev, M.; Mallot, K.; Maneva, G.; Manganaro, M.; Mannheim, K.; Maraschi, L.; Marcote, B.; Mariotti, M.; Martínez, M.; Mazin, D.; Menzel, U.; Miranda, J. M.; Mirzoyan, R.; Moralejo, A.; Nakajima, D.; Neustroev, V.; Niedzwiecki, A.; Nievas Rosillo, M.; Nilsson, K.; Nishijima, K.; Noda, K.; Orito, R.; Overkemping, A.; Paiano, S.; Palacio, J.; Palatiello, M.; Paneque, D.; Paoletti, R.; Paredes, J. M.; Paredes Fortuny, X.; Persic, M.; Poutanen, J.; Prada Moroni, P. G.; Prandini, E.; Puljak, I.; Reinthal, R.; Rhode, W.; Ribó, M.; Rico, J.; Rodriguez Garcia, J.; Saito, T.; Saito, K.; Satalecka, K.; Scapin, V.; Schultz, C.; Schweizer, T.; Sillanpää, A.; Sitarek, J.; Snidaric, I.; Sobczynska, D.; Stamerra, A.; Steinbring, T.; Strzys, M.; Takalo, L.; Takami, H.; Tavecchio, F.; Temnikov, P.; Terzić, T.; Tescaro, D.; Teshima, M.; Thaele, J.; Torres, D. F.; Toyama, T.; Treves, A.; Verguilov, V.; Vovk, I.; Will, M.; Zanin, R.; Desiante, R.; Hays, E.

doi:10.1051/0004-6361/201526478

Context. In the last five years the Fermi Large Area Telescope (LAT) instrument detected GeV γ-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 γ-ray spectrum at TeV energies. Aims: We aim to explore the very high-energy domain to search for γ-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; optical and subsequent GeV γ-ray detections triggered the MAGIC observations. We also briefly report on VHE observations of the symbiotic nova YY Her and the dwarf nova ASASSN-13ax. We complement the TeV MAGIC observations 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 leptons and hadrons. Results: No significant TeV emission was found from the studied sources. We computed upper limits on the spectrum and night-by-night flux. The combined GeV and TeV observations of V339 Del limit the ratio of proton to electron luminosities to Lp ≲ 0.15 Le.

Titolo:	Very high-energy γ -ray observations of novae and dwarf novae with the MAGIC telescopes
Autori:	Ahnen, M. L Ansoldi, S. Antonelli, L. A. Antoranz, P. Babic, A. Banerjee, B. Bangale, P. Barres De Almeida, U. Barrio, J. A. Becerra González, J. Bednarek, W. Bernardini, E. Biasuzzi, B. Biland, A. Blanch, O. Bonnefoy, S. Bonnoli, G. Borracci, F. Bretz, T. Carmona, E. Carosi, A. Chatterjee, A. Clavero, R. Colin, P. Colombo, E. Contreras, J. L. Cortina, J. Covino, S. Da Vela, P. Dazzi, F. De Angelis, A. De Caneva, G. De Lotto, B. De Oña Wilhelmi, E. Delgado Mendez, C. Di Pierro, F. Dominis Prester, D. Dorner, D. Doro, M. Einecke, S. Eisenacher Glawion, D. Elsaesser, D. Fernández Barral, A. Fidalgo, D. Fonseca, M. V. Font, L. Frantzen, K. Fruck, C. Galindo, D. García López, R. J. Garczarczyk, M. Garrido Terrats, D. Gaug, M. Giammaria, P. Godinović, N. González Muñoz, A. Guberman, D. Hanabata, Y. Hayashida, M. Herrera, J. Hose, J. Hrupec, D. Hughes, G. Idec, W. Kellermann, H. Kodani, K. Konno, Y. Kubo, H. Kushida, J. La Barbera, A. Lelas, D. Lewandowska, N. Lindfors, E. Lombardi, S. LONGO, FRANCESCO López, M. López Coto, R. López Oramas, A. Lorenz, E. Majumdar, P. Makariev, M. Mallot, K. Maneva, G. Manganaro, M. Mannheim, K. Maraschi, L. Marcote, B. Mariotti, M. Martínez, M. Mazin, D. Menzel, U. Miranda, J. M. Mirzoyan, R. Moralejo, A. Nakajima, D. Neustroev, V. Niedzwiecki, A. Nievas Rosillo, M. Nilsson, K. Nishijima, K. Noda, K. Orito, R. Overkemping, A. Paiano, S. Palacio, J. Palatiello, M. Paneque, D. Paoletti, R. Paredes, J. M. Paredes Fortuny, X. Persic, M. Poutanen, J. Prada Moroni, P. G. Prandini, E. Puljak, I. Reinthal, R. Rhode, W. Ribó, M. Rico, J. Rodriguez Garcia, J. Saito, T. Saito, K. Satalecka, K. Scapin, V. Schultz, C. Schweizer, T. Sillanpää, A. Sitarek, J. Snidaric, I. Sobczynska, D. Stamerra, A. Steinbring, T. Strzys, M. Takalo, L. Takami, H. Tavecchio, F. Temnikov, P. Terzić, T. Tescaro, D. Teshima, M. Thaele, J. Torres, D. F. Toyama, T. Treves, A. Verguilov, V. Vovk, I. Will, M. Zanin, R. Desiante, R. Hays, E. mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2015
Rivista:	ASTRONOMY & ASTROPHYSICS
Abstract:	Context. In the last five years the Fermi Large Area Telescope (LAT) instrument detected GeV γ-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 γ-ray spectrum at TeV energies. Aims: We aim to explore the very high-energy domain to search for γ-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; optical and subsequent GeV γ-ray detections triggered the MAGIC observations. We also briefly report on VHE observations of the symbiotic nova YY Her and the dwarf nova ASASSN-13ax. We complement the TeV MAGIC observations 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 leptons and hadrons. Results: No significant TeV emission was found from the studied sources. We computed upper limits on the spectrum and night-by-night flux. The combined GeV and TeV observations of V339 Del limit the ratio of proton to electron luminosities to Lp ≲ 0.15 Le.
Handle:	http://hdl.handle.net/11368/2871684
Digital Object Identifier (DOI):	10.1051/0004-6361/201526478
URL:	http://www.edpsciences.org/journal/index.cfm?edpsname=aa http://www.aanda.org/articles/aa/abs/2015/10/contents/contents.html?sort=article_number
Appare nelle tipologie:	1.1 Articolo in Rivista

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