Galaxies and gamma-ray astronomy

Details Galaxies and gamma-ray astronomy Galaxies and gamma-ray astronomy

Sep 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...232..649b&link_type=abstract

Astrophysical Journal, Part 1, vol. 232, Sept. 15, 1979, p. 649-658.

Astronomy and Astrophysics

Astronomy

130

Bl Lacertae Objects, Cosmology, Gamma Ray Astronomy, Quasars, Seyfert Galaxies, Active Galaxies, Energy Spectra, Extraterrestrial Radiation, Radio Galaxies, X Ray Astronomy

Scientific paper

The nature of the high-energy spectra of several types of active galaxies and their contribution to the measured diffuse gamma-ray emission between 1 and 150 MeV are considered, using X-ray spectra of active galaxies and SAS 2 data regarding the intensity upper limits to the gamma-ray emission above 35 MeV. It is found that a substantial increase in slope of the photon energy spectrum must occur in the low energy gamma-ray region for Seyfert galaxies, BL Lac objects, and emission line galaxies; the power-law spectra observed in the X-ray range must steepen substantially between 50 keV and 50 MeV. In addition, a cosmological integration shows that Seyfert galaxies, BL Lac objects, and quasars may account for most of the 1-150 MeV diffuse background, even without significant evolution.

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