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http://hdl.handle.net/2445/69532
Title: | Very high-energy γ-ray observations of novae and dwarf novae with the MAGIC telescopes |
Author: | MAGIC Collaboration Marcote Martin, Benito Munar i Adrover, Pere Paredes i Poy, Josep Maria Paredes Fortuny, Xavier Ribó Gomis, Marc Zanin, Roberta |
Keywords: | Estels binaris de raigs X Noves (Estels) Raigs gamma X-ray binaries New stars Gamma rays |
Issue Date: | 8-Oct-2015 |
Publisher: | Springer Verlag |
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. |
Note: | Versió postprint del document publicat a: http://dx.doi.org/10.1051/0004-6361/201526478 |
It is part of: | Astronomy and Astrophysics, 2015, vol. 582, p. A67-A74 |
URI: | http://hdl.handle.net/2445/69532 |
Related resource: | http://dx.doi.org/10.1051/0004-6361/201526478 |
ISSN: | 0004-6361 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) |
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