Bibcode
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, F.; 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. et al.
Bibliographical reference
Astronomy and Astrophysics, Volume 582, id.A67, 7 pp.
Advertised on:
10
2015
Journal
Citations
23
Refereed citations
20
Description
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.
Appendix A is available in electronic form at http://www.aanda.org
Related projects
Particle Astrophysics
The MAGIC Collaboration is integrated by 20 research institutes and university departments from Armenia, Bulgaria, Finland, Germany, Italy, Poland, Spain, Switzerland and USA. The collaboration comprises two 17m diameter telescopes, located at the Roque de los Muchachos Observatory, designed to measure the Cherenkov radiation associated with
Ramón
García López