Other
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..921..480b&link_type=abstract
THE FIRST GLAST SYMPOSIUM. AIP Conference Proceedings, Volume 921, pp. 480-481 (2007).
Other
Gamma-Ray Sources, Gamma-Ray Bursts, Background Radiations, Gamma-Ray
Scientific paper
The extragalactic gamma ray background (EGRB) could arise from two distinct scenarios : truly diffuse processes or from unresolved point sources. Here we examine contribution from unresolved normal galaxies, starburst galaxies and AGNs. γ-ray emission from normal galaxies is mostly due to cosmic ray interactions with interstellar matter and radiation. Though no starburst galaxy has been detected so far in γ-rays, enhanced supernovae activity is expected to lead to higher cosmic ray densities, making starburst galaxies sufficiently γ-ray luminous to be detected by GLAST. γ-rays from blazars are believed to arise from relativistic jets. The γ-ray emission is expected to decrease with increasing jet inclination angle. The γ-ray detection of Cen A and NGC 6251 suggests, other sub-classes of AGNs could also be potential contributors to the γ-ray background. Preliminary results are discussed.
Bhattacharya Dipen
Mukherjee Rajesh
Sreekumar Parameswaran
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