Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apj...722.1303a&link_type=abstract
The Astrophysical Journal, Volume 722, Issue 2, pp. 1303-1311 (2010).
Astronomy and Astrophysics
Astronomy
24
Acceleration Of Particles, Ism: Individual Objects: W49B, Radiation Mechanisms: Non-Thermal
Scientific paper
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.
Abdo Aws Ahmad
Ackermann Marcelo
Ajello Marco
Baldini Luca
Ballet Jean
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