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

Venters, Tonia M. and Pavlidou, Vasiliki and Reyes, Luis C. (2009) The Extragalactic Background Light Absorption Feature in the Blazar Component of the Extragalactic Gamma-ray Background. Astrophysical Journal, 703 (2). pp. 1939-1946. ISSN 0004-637X. https://resolver.caltech.edu/CaltechAUTHORS:20091013-080737379

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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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/0004-637X/703/2/1939 DOIUNSPECIFIED
http://www.iop.org/EJ/abstract/0004-637X/703/2/1939/PublisherUNSPECIFIED
Additional Information:© 2009 The American Astronomical Society. Received 2009 April 13; accepted 2009 August 18; published 2009 September 15. We acknowledge enlightening feedback from Angela Olinto, Joel Primack, and Floyd Stecker. 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 and an endowment from the Kavli Foundation and its founder Fred Kavli. T.M.V. was supported by an NSF Graduate Research Fellowship. V.P. acknowledges support by NASA through the GLAST Fellowship Program, NASA Cooperative Agreement: NNG06DO90A.
Funders:
Funding AgencyGrant Number
NSFPHY-0114422
NSFPHY-0551142
NASANNG06DO90A
Subject Keywords:diffuse radiation; galaxies: active; gamma rays: observations; gamma rays: theory
Issue or Number:2
Record Number:CaltechAUTHORS:20091013-080737379
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20091013-080737379
Official Citation:The Extragalactic Background Light Absorption Feature in the Blazar Component of the Extragalactic Gamma-ray Background Tonia M. Venters, Vasiliki Pavlidou, and Luis C. Reyes 2009 ApJ 703 1939-1946 doi: 10.1088/0004-637X/703/2/1939
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:16286
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:14 Oct 2009 16:16
Last Modified:03 Oct 2019 01:09

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