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标题：The supernova remnant W49B as seen with H.E.S.S. and Fermi-LAT ★
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作者：H. Abdalla ; A. Abramowski ; F. Aharonian 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2018
卷号：612
DOI：10.1051/0004-6361/201527843
语种：English
出版社：EDP Sciences
摘要：The supernova remnant (SNR) W49B originated from a core-collapse supernova that occurred between one and four thousand years ago, and subsequently evolved into a mixed-morphology remnant, which is interacting with molecular clouds (MC). Gamma-ray observations of SNR-MC associations are a powerful tool to constrain the origin of Galactic cosmic rays, as they can probe the acceleration of hadrons through their interaction with the surrounding medium and subsequent emission of non-thermal photons. We report the detection of aγ-ray source coincident with W49B at very high energies (VHE;E> 100 GeV) with the H.E.S.S. Cherenkov telescopes together with a study of the source with five years ofFermi-LAT high-energyγ-ray (0.06–300 GeV) data. The smoothly connected, combined source spectrum, measured from 60 MeV to multi-TeV energies, shows two significant spectral breaks at 304 ± 20 MeV and 8.4−2.5+2.2GeV; the latter is constrained by the joint fit from the two instruments. The detected spectral features are similar to those observed in several other SNR-MC associations and are found to be indicative ofγ-ray emission produced through neutral-pion decay.
关键词：Key wordsengamma rays: generalISM: supernova remnantsISM: clouds