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

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cris.lastimport.scopus2024-02-12T19:57:51Z
dc.abstract.enThe 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<SUB>-2.5</SUB><SUP>+2.2</SUP> 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. The H.E.S.S. gamma-ray excess map (see Fig. 1, in FITS format) of the W49 region is only available at the CDS via anonymous ftp to <A href=http://cdsarc.u-strasbg.fr>http://cdsarc.u-strasbg.fr</A> (<A href=http://cdsarc.u-strasbg.fr>http://130.79.128.5</A>) or via <A href=http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/612/A5>http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/612/A5</A>
dc.affiliationUniwersytet Warszawski
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dc.date.accessioned2024-01-26T10:49:15Z
dc.date.available2024-01-26T10:49:15Z
dc.date.copyright2016-09-02
dc.date.issued2018
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financeNie dotyczy
dc.description.versionORIGINAL_AUTHOR
dc.description.volume612
dc.identifier.doi10.1051/0004-6361/201527843
dc.identifier.issn0004-6361
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/123204
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2018A&A...612A...5H
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstronomy and Astrophysics
dc.relation.pagesA5
dc.rightsOther
dc.sciencecloudnosend
dc.titleThe supernova remnant W49B as seen with H.E.S.S. and Fermi-LAT
dc.typeJournalArticle
dspace.entity.typePublication