Diffuse gamma-ray background from Seyfert galaxies

Details Diffuse gamma-ray background from Seyfert galaxies Diffuse gamma-ray background from Seyfert galaxies

May 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978natur.273..211g&link_type=abstract

Nature, vol. 273, May 18, 1978, p. 211.

Astronomy and Astrophysics

Astronomy

17

Background Radiation, Diffuse Radiation, Gamma Ray Astronomy, Seyfert Galaxies, Compton Effect, Galactic Evolution, Galactic Nuclei, Uhuru Satellite, X Ray Sources

Scientific paper

It is suggested that the diffuse background spectrum observed at hard X-ray and gamma-ray energies can be accounted for by Seyferts. Presented as evidence are specific Type I Seyfert galaxies which have been positively identified as X-ray sources, e.g., NGC4151 and 3C120. Their spectra are both hard, and extend to cutoff energies of greater than 100 keV, up to 1 MeV. Still higher energies have been observed from NGC4151, where the power law is extended from the hard X-ray range to a break at 3 MeV, i.e., gamma-ray range.

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