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The supernova remnant W49B as seen with H.E.S.S. and Fermi-LAT*

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 to...

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Main Authors: Abdalla, Hassan (Author) , Jankowsky, Felix (Author) , Mohamed, Mahmoud (Author) , Quirrenbach, Andreas (Author) , Rieger, Frank M. (Author) , Schwemmer, Stephanie (Author) , Wagner, Stefan (Author) , Cologna, Gabriele (Author) , Hofmann, Werner (Author)
Corporate Author: H.E.S.S. Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 09 April 2018
In: Astronomy and astrophysics
Year: 2018, Volume: 612
ISSN:1432-0746
DOI:10.1051/0004-6361/201527843
Online Access:Verlag, Volltext: https://doi.org/10.1051/0004-6361/201527843
Verlag, Volltext: https://www.aanda.org/articles/aa/abs/2018/04/aa27843-15/aa27843-15.html
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Author Notes:H.E.S.S. Collaboration: H. Abdalla, G. Cologna, W. Hofmann, F. Jankowsky, M. Mohamed, A. Quirrenbach, F. Rieger, S. Schwemmer, S.J. Wagner [und weitere]
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Summary: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 <i>γ<i/>-ray source coincident with W49B at very high energies (VHE; <i>E<i/> > 100 GeV) with the H.E.S.S. Cherenkov telescopes together with a study of the source with five years of <i>Fermi<i/>-LAT high-energy <i>γ<i/>-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 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 <i>γ<i/>-ray emission produced through neutral-pion decay.
Item Description:Gesehen am 18.06.2019
Physical Description:Online Resource
ISSN:1432-0746
DOI:10.1051/0004-6361/201527843

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