The Redshift Dependence of Gamma-Ray Absorption in the Environments of Strong-Line AGNs

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The case of {gamma}-ray absorption due to photon-photon pair production of jet photons in the external photon environments, such as the accretion disk and the broad-line region radiation fields, of {gamma}-ray--loud active galactic nuclei (AGNs) that exhibit strong emission lines is considered. I demonstrate that this 'local opacity,' if detected, will almost unavoidably be redshift-dependent in the sub-TeV range. This introduces nonnegligible biases and complicates approaches for studying the evolution of the extragalactic background light with contemporary GeV instruments such as the Gamma-Ray Large Area Space Telescope (GLAST ), where the {gamma}-ray horizon is probed by means of statistical analysis ... continued below

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Reimer, A. & /Stanford U., HEPL /KIPAC, Menlo Park November 12, 2007.

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The case of {gamma}-ray absorption due to photon-photon pair production of jet photons in the external photon environments, such as the accretion disk and the broad-line region radiation fields, of {gamma}-ray--loud active galactic nuclei (AGNs) that exhibit strong emission lines is considered. I demonstrate that this 'local opacity,' if detected, will almost unavoidably be redshift-dependent in the sub-TeV range. This introduces nonnegligible biases and complicates approaches for studying the evolution of the extragalactic background light with contemporary GeV instruments such as the Gamma-Ray Large Area Space Telescope (GLAST ), where the {gamma}-ray horizon is probed by means of statistical analysis of absorption features (e.g., the Fazio-Stecker relation) in AGN spectra at various redshifts. It particularly applies to strong-line quasars, where external photon fields are potentially involved in {gamma}-ray production.

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  • Journal Name: Astrophys.J.665:1023-1029,2007; Journal Volume: 665

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  • Report No.: SLAC-PUB-12991
  • Grant Number: AC02-76SF00515
  • DOI: 10.1086/519766 | External Link
  • Office of Scientific & Technical Information Report Number: 919796
  • Archival Resource Key: ark:/67531/metadc899037

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  • November 12, 2007

Added to The UNT Digital Library

  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 7, 2016, 8:18 p.m.

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Reimer, A. & /Stanford U., HEPL /KIPAC, Menlo Park. The Redshift Dependence of Gamma-Ray Absorption in the Environments of Strong-Line AGNs, article, November 12, 2007; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc899037/: accessed December 12, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.