Astrophysics and Space Science

, Volume 93, Issue 1, pp 135–140 | Cite as

Positron annihilation radiation from Seyfert nuclei and the cosmic diffuse γ-ray background

  • L. Bassani
  • A. J. Dean


Observational features in the low energy γ-ray spectra of Seyfert galaxies are interpreted in terms of broad and blueshifted annihilation radiation. The possibility that this ‘line’ emission is the underlying source of the bump in the cosmic diffuse γ-ray background is investigated. The observational data available in the literature are then used to estimate the maximum temperature of the electron positron plasma and the average positron annihilation rate for Seyfert galaxies. The assumption that other active nuclei, namely radio galaxies and quasars, are powered by the same annihilation mechanism is used to set limits on their contribution to the cosmic diffuse γ-ray background.


Active Galactic Nucleus Positron Annihilation Radio Galaxy Seyfert Galaxy Diffuse Emission 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© D. Reidel Publishing Co. 1983

Authors and Affiliations

  • L. Bassani
    • 1
  • A. J. Dean
    • 1
  1. 1.Department of PhysicsUniversity of SouthamptonSouthamptonEngland

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