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Prospects and requirements for measurements of extragalactic γ-ray lines

  • Richard E. Griffiths

Abstract

A brief summary is presented of requirements for the measurements of extragalactic γ-ray lines. The electron-positron annihilation line at 511 keV represents the best prospect, and although this line is greatly broadened in active galactic nuclei, a narrow line should be present in clusters of galaxies and radio lobes as a result of prior AGN activity. The strongest fluxes should be of the order of 10−4 photons cm−2 s−1 from the closest extended sources.

Keywords

Extragalactic Gamma-rays AGN Clusters of galaxies 

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Copyright information

© Springer 2006

Authors and Affiliations

  • Richard E. Griffiths
    • 1
  1. 1.Carnegie Mellon UniversityUSA

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