Diffuse gamma rays from discrete extragalactic sources

A. W. Strong, A. W. Wolfendale, D. M. Worrall

Research output: Contribution to journalArticle (Academic Journal)peer-review


An estimate is made of the fraction of the diffuse gamma-ray background originating in discrete sources rather than intergalactic space. It is shown that 'normal' galaxies probably contribute about 4% of the gamma-ray flux above 100 MeV. Radio galaxies can produce the bulk of the 1-10-MeV background if there is proportionality between their gamma-ray and radio luminosities. Seyfert galaxies and clusters can account for most of the 100-MeV observations if the X-ray and gamma-ray emissions are produced by the inverse Compton mechanism.
Original languageEnglish
Pages (from-to)1553-1566
Number of pages14
JournalJournal of Physics A: Mathematical and General
Publication statusPublished - 1 Sept 1976


  • Background Radiation
  • Diffuse Radiation
  • Extragalactic Radio Sources
  • Gamma Rays
  • Radio Galaxies
  • X Rays
  • Astronomical Models
  • Galactic Clusters
  • Luminous Intensity
  • Seyfert Galaxies
  • X Ray Spectra


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