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dc.contributor.authorMAGIC Collaboration-
dc.contributor.authorMarcote Martin, Benito-
dc.contributor.authorMunar i Adrover, Pere-
dc.contributor.authorParedes i Poy, Josep Maria-
dc.contributor.authorParedes Fortuny, Xavier-
dc.contributor.authorRibó Gomis, Marc-
dc.contributor.authorZanin, Roberta-
dc.description.abstractContext. 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.-
dc.format.extent7 p.-
dc.publisherSpringer Verlag-
dc.relation.isformatofVersió postprint del document publicat a:
dc.relation.ispartofAstronomy and Astrophysics, 2015, vol. 582, p. A67-A74-
dc.rights(c) Springer Verlag, 2015-
dc.subject.classificationEstels binaris de raigs X-
dc.subject.classificationNoves (Estels)-
dc.subject.classificationRaigs gamma-
dc.subject.otherX-ray binaries-
dc.subject.otherNew stars-
dc.subject.otherGamma rays-
dc.titleVery high-energy γ-ray observations of novae and dwarf novae with the MAGIC telescopes-
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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