Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...330l...5y&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 330, July 1, 1988, p. L5-L8.
Astronomy and Astrophysics
Astronomy
4
Background Radiation, Extraterrestrial Radiation, Gamma Ray Astronomy, Quasars, Seyfert Galaxies, X Ray Sources, Active Galactic Nuclei, Big Bang Cosmology, Red Shift, Stellar Luminosity
Scientific paper
The SAS 2 γ-ray data and the Lick Survey galaxy count data have been used to determine statistically the absolute luminosities of quasars in the 35 - 100 MeV range. A functional relationship between these luminosities and those at 2500 Å of quasars is then established. Using the optical luminosity function given by Marshall in 1985, the authors find that the contribution of quasars to the diffuse γ-ray background is about 40% of the total. In the same way, by using the optical luminosity function reported by Cheng et al. in 1985, they obtain the contribution of Seyfert galaxies (class 1 and 1.5) to be about 20% of the total. Therefore the extragalactic γ-ray background in the 35 - 100 MeV range is likely to be generated mainly by discrete extragalactic objects.
Young Enoch C. M.
Yu K. N.
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