Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/112084
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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: a European journal, 2018; 612:A5-1-A5-10 |
Publisher: | EDP Sciences |
Issue Date: | 2018 |
ISSN: | 0004-6361 1432-0746 |
Statement of Responsibility: | 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 |
DOI: | 10.1051/0004-6361/201527843 |
Grant ID: | ARC |
Published version: | http://dx.doi.org/10.1051/0004-6361/201527843 |
Appears in Collections: | Aurora harvest 3 IPAS publications Physics publications |
Files in This Item:
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hdl_112084.pdf | Published version | 1.26 MB | Adobe PDF | View/Open |
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