The EBL Absorption Feature in the Blazar Component of the Gamma-ray Background

Details The EBL Absorption Feature in the Blazar Component of the Gamma-ray Background The EBL Absorption Feature in the Blazar Component of the Gamma-ray Background

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21360809v&link_type=abstract

American Astronomical Society, AAS Meeting #213, #608.09

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The study of the diffuse Extragalactic Gamma-ray Background (EGRB) provides insight into the high-energy processes of the universe. Though the census of contributors to the EGRB is still quite unclear, collective emission from unresolved gamma-ray emitters, like blazars, certainly plays a role. Theoretical determinations of the blazar contribution to the EGRB predict that emission from blazars constitute as little as a few percent to as much as 100 percent of the overall emission with the uncertainty resulting from the uncertainty in the blazar gamma-ray luminosity function. Additionally, TeV gamma rays from blazars cascade through the Extragalactic Background Light resulting in an enhancement of the EGRB at lower energies and a suppression at higher energies, the prominence of which depends on the redshift distribution of blazars. Thus, the study of the blazar contribution to the EGRB with GLAST and other high-energy astrophysics experiments can provide a better understanding of blazars as a cosmological population.
This work was supported in part by the Kavli Institute for Cosmological Physics at the University of Chicago through grants NSF PHY-0114422 and NSF PHY-0551142, the Fred Kavli Foundation, and the NSF Graduate Research Fellowship Program.

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