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

• Verfasst von: Abdalla, Hassan [VerfasserIn]
• Verfasst von: Jankowsky, Felix [VerfasserIn]
• Verfasst von: Mohamed, Mahmoud [VerfasserIn]
• Verfasst von: Quirrenbach, Andreas [VerfasserIn]
• Verfasst von: Rieger, Frank M. [VerfasserIn]
• Verfasst von: Schwemmer, Stephanie [VerfasserIn]
• Verfasst von: Wagner, Stefan [VerfasserIn]
• Verfasst von: Cologna, Gabriele [VerfasserIn]
• Verfasst von: Hofmann, Werner [VerfasserIn]
• Titel: The supernova remnant W49B as seen with H.E.S.S. and Fermi-LAT*
• Körperschaft: H.E.S.S. Collaboration [VerfasserIn]
• Verf.angabe: 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]
• E-Jahr: 2018
• Jahr: 09 April 2018
• Umfang: 10 S.
• Fussnoten: Gesehen am 18.06.2019
• Titel Quelle: Enthalten in: Astronomy and astrophysics
• Ort Quelle: Les Ulis : EDP Sciences, 1969
• Jahr Quelle: 2018
• Band/Heft Quelle: 612(2018) Artikel-Nummer A5, 10 Seiten
• ISSN Quelle: 1432-0746
• DOI: doi:10.1051/0004-6361/201527843
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1666329789

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 <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.