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

Abstract

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 × 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 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 >10 4 eV cm –3, for either gamma-ray production mechanism.

Authors:
 [1]
  1. Naval Research Lab. (NRL), Washington, DC (United States); et al.
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
Fermi LAT Collaboration
OSTI Identifier:
1357522
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 722; Journal Issue: 2; Journal ID: ISSN 0004-637X
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Abdo, A. A. Fermi -Lat Study Of Gamma-Ray Emission In The Direction Of Supernova Remnant W49B. United States: N. p., 2010. Web. doi:10.1088/0004-637X/722/2/1303.
Abdo, A. A. Fermi -Lat Study Of Gamma-Ray Emission In The Direction Of Supernova Remnant W49B. United States. doi:10.1088/0004-637X/722/2/1303.
Abdo, A. A. Wed . "Fermi -Lat Study Of Gamma-Ray Emission In The Direction Of Supernova Remnant W49B". United States. doi:10.1088/0004-637X/722/2/1303. https://www.osti.gov/servlets/purl/1357522.
@article{osti_1357522,
title = {Fermi -Lat Study Of Gamma-Ray Emission In The Direction Of Supernova Remnant W49B},
author = {Abdo, A. A.},
abstractNote = {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.},
doi = {10.1088/0004-637X/722/2/1303},
journal = {Astrophysical Journal},
number = 2,
volume = 722,
place = {United States},
year = {2010},
month = {9}
}

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