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2015-10-08

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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/69532

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

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http://dx.doi.org/10.1051/0004-6361/201526478

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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.

Matèries

Estels binaris de raigs X, Noves (Estels), Raigs gamma

Matèries (anglès)

X-ray binaries, New stars, Gamma rays

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Articles publicats en revistes (Física Quàntica i Astrofísica)
Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

Citació

MAGIC Collaboration, et al. Very high-energy γ-ray observations of novae and dwarf novae with the MAGIC telescopes. Astronomy and Astrophysics. 2015. Vol. 582, num. A67-A74. ISSN 0004-6361. [consulted: 18 of August of 2026]. Available at: https://hdl.handle.net/2445/69532

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