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Fermi-LAT study of Gamma-ray emission in the direction of supernova remnant W49B
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2010 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 722, no 2, 1303-1311 p.Article in journal (Refereed) Published
Abstract [en]

We present an analysis of the gamma-ray data obtained with the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope in the direction of SNR W49B (G43.3-0.2). A bright unresolved gamma-ray source detected at a significance of 38 sigma is found to coincide with SNR W49B. The energy spectrum in the 0.2-200 GeV range gradually steepens toward high energies. The luminosity is estimated to be 1.5 x 10(36) (D/8 kpc)(2) erg s(-1) in this energy range. There is no indication that the gamma-ray emission comes from a pulsar. Assuming that the supernova remnant (SNR) shell is the site of gamma-ray production, the observed spectrum can be explained either by the decay of neutral pi mesons produced through the proton-proton collisions or by electron bremsstrahlung. The calculated energy density of relativistic particles responsible for the LAT flux is estimated to be remarkably large, U-e,U-p > 10(4) eV cm(-3), for either gamma-ray production mechanism.

Place, publisher, year, edition, pages
2010. Vol. 722, no 2, 1303-1311 p.
Keyword [en]
acceleration of particles, ISM: individual objects (W49B), radiation mechanisms: non-thermal
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:kth:diva-27096DOI: 10.1088/0004-637X/722/2/1303ISI: 000284075400026ScopusID: 2-s2.0-78149236068OAI: diva2:376015
QC 20101209Available from: 2010-12-09 Created: 2010-12-06 Last updated: 2010-12-09Bibliographically approved

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