Fermi -Lat Study Of Gamma-Ray Emission In The Direction Of Supernova Remnant W49B

Abdo, A. A.

doi:10.1088/0004-637X/722/2/1303

Fermi -Lat Study Of Gamma-Ray Emission In The Direction Of Supernova Remnant W49B

Journal Article · Wed Sep 29 00:00:00 EDT 2010 · The Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/722/2/1303· OSTI ID:1357522

Abdo, A. A. ^[1]

Naval Research Lab. (NRL), Washington, DC (United States); et al.

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 38σ 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 × 10³⁶ (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 π 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,p >10⁴ eV cm^–3, for either gamma-ray production mechanism.

View Accepted Manuscript (DOE)

Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: Fermi LAT Collaboration

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1357522

Alternate ID(s):: OSTI ID: 21464621

Journal Information:: The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 2 Vol. 722; ISSN 0004-637X

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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