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Title:
The Extragalactic Background Light Absorption Feature in the Blazar Component of the Extragalactic Gamma-ray Background
Authors:
Venters, Tonia M.; Pavlidou, Vasiliki; Reyes, Luis C.
Affiliation:
AA(Department of Astronomy and Astrophysics, The University of Chicago, Chicago, IL 60637, USA ), AB(Department of Astronomy, The California Institute of Technology, Pasadena, CA 91125, USA ; Kavli Institute for Cosmological Physics and Enrico Fermi Institute, The University of Chicago, Chicago, IL 60637, USA ; Einstein Fellow.), AC(Kavli Institute for Cosmological Physics and Enrico Fermi Institute, The University of Chicago, Chicago, IL 60637, USA )
Publication:
The Astrophysical Journal, Volume 703, Issue 2, pp. 1939-1946 (2009). (ApJ Homepage)
Publication Date:
10/2009
Origin:
IOP
ApJ Keywords:
diffuse radiation, galaxies: active, gamma rays: observations, gamma rays: theory
DOI:
10.1088/0004-637X/703/2/1939
Bibliographic Code:
2009ApJ...703.1939V

Abstract

High-energy photons from cosmological emitters suffer attenuation due to pair production interactions with the extragalactic background light (EBL). The collective emission of any high-energy emitting cosmological population will exhibit an absorption feature at the highest energies. We calculate this absorption feature in the collective emission of blazars for various models of the blazar gamma-ray luminosity function (GLF) and the EBL. We find that models of the blazar GLF that predict higher relative contributions of high-redshift blazars to the blazar collective spectrum result in emission that is more susceptible to attenuation by the EBL, and hence result in more prominent absorption features, allowing for better differentiation amongst EBL models. We thus demonstrate that observations of such an absorption feature will contain information regarding both the blazar GLF and the EBL, and we discuss tests for EBL models and the blazar GLF that will become possible with upcoming Fermi observations.
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