Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...21116018v&link_type=abstract
American Astronomical Society, AAS Meeting #211, #160.18
Astronomy and Astrophysics
Astronomy
Scientific paper
We present a method for determining the parameters of an intrinsic spectral index distribution (ISID) of a class of gamma-ray emitters while accounting for error in measurement of the spectral indices of these emitters. We apply this method to the set of confident blazars from the Energetic Gamma-ray Experiment Telescope (EGRET) and a set of simulated Gamma-ray Large Area Space Telescope (GLAST) blazars. We find that the maximum likelihood ISID for EGRET blazars has a mean spectral index of 2.27 and a standard deviation of 0.20. We also test for spectral index hardening associated with blazar variability finding no evidence for such a phenomenon. Finally, we calculate the unabsorbed spectral shape of the blazar contribution to the extra- galactic gamma-ray background (EGRB) using the derived ISID, finding a (relatively) mildly convex, though not very well constrained, spectrum.
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