Seyfert galaxies and the cosmic gamma-ray diffuse background

Details Seyfert galaxies and the cosmic gamma-ray diffuse background Seyfert galaxies and the cosmic gamma-ray diffuse background

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ap%26ss..82..199b&link_type=abstract

Astrophysics and Space Science, vol. 82, no. 1, Feb. 1982, p. 199-207.

Astronomy and Astrophysics

Astronomy

8

Background Radiation, Cosmic Rays, Diffuse Radiation, Galactic Radiation, Gamma Ray Spectra, Seyfert Galaxies, Active Galaxies, Galactic Nuclei, Luminosity, Radiant Flux Density, X Ray Astronomy

Scientific paper

The similarity between the spectral characteristics of the three active galaxies NGC 4151, NGC 1275 and MCG 8-11-11, which are generally classified as Seyferts and are powerful, low-energy gamma-ray sources, with those of the cosmic background at gamma-ray energies suggests that these objects may significantly contribute to this diffuse flux. Two number densities of gamma-ray-emitting Seyfert galaxies based on both optical and X-ray data are employed in an assessment of this contribution, and a comparison of the estimated and measured diffuse gamma-ray background intensities is used to gain a deeper understanding of the metabolism of Seyfert galaxies.

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