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Type: Journal article
Title: The supernova remnant W49B as seen with H.E.S.S. and Fermi-LAT
Author: H.E.S.S. Collaboration
Abdalla, H.
Abramowski, A.
Aharonian, F.
Benkhali, F.
Akhperjanian, A.
Andersson, T.
Angüner, E.
Arrieta, M.
Aubert, P.
Backes, M.
Balzer, A.
Barnard, M.
Becherini, Y.
Tjus, J.
Berge, D.
Bernhard, S.
Bernlöhr, K.
Blackwell, R.
Böttcher, M.
et al.
Citation: Astronomy and Astrophysics, 2018; 612:A5-1-A5-10
Publisher: EDP Sciences
Issue Date: 2018
ISSN: 0004-6361
Statement of
H.E.S.S. Collaboration: H. Abdalla … R. Blackwell … P. DeWilt … J. Hawkes … J. Lau … N. Maxted … G. Rowell … F. Voisin … et al.
Abstract: 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 γ-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 γ-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+2.2 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 γ-ray emission produced through neutral-pion decay.
Keywords: Gamma rays: general; ISM: supernova remnants; ISM: clouds
Rights: © ESO 2018
RMID: 0030085924
DOI: 10.1051/0004-6361/201527843
Appears in Collections:IPAS publications
Physics publications

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