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The supernova remnant W49B as seen with HESS and Fermi-LAT
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC). Linnaeus University, Sweden.
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).ORCID-id: 0000-0002-0738-7581
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).ORCID-id: 0000-0002-2011-1889
Vise andre og tillknytning
Rekke forfattare: 2542018 (engelsk)Inngår i: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 612, artikkel-id A5Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

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 a gamma-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 of Fermi-LAT high-energy gamma-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)(+2.5) GeV; 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 of gamma-ray emission produced through neutral-pion decay.

sted, utgiver, år, opplag, sider
2018. Vol. 612, artikkel-id A5
Emneord [en]
gamma rays: general, ISM: supernova remnants, ISM: clouds
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-155941DOI: 10.1051/0004-6361/201527843ISI: 000429404700005OAI: oai:DiVA.org:su-155941DiVA, id: diva2:1215493
Tilgjengelig fra: 2018-06-08 Laget: 2018-06-08 Sist oppdatert: 2019-12-09bibliografisk kontrollert

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Conrad, Jan M.Farnier, ChristianMeyer, ManuelMorå, KnutSpengler, GerritWagner, Robert M.
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