Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...378l..17r&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 378, Sept. 1, 1991, p. L17-L20.
Astronomy and Astrophysics
Astrophysics
14
Background Radiation, Compton Effect, Cosmic X Rays, Endeavour (Orbiter), Gamma Rays, X Ray Sources, Astronomical Models, Gamma Ray Spectra, Reflected Waves, Spectrum Analysis
Scientific paper
The gamma-ray spectrum of an AGN in the Compton reflection model is calculated and the contribution of such sources to the cosmic gamma-ray background is considered. The spectrum is composed of three parts: an X-ray power law, a broad hump from roughly 10 to 120 keV due to reprocessing of the power-law X-ray spectrum by cold gas, and gamma rays which are due to the inverse-Compton scattering of X-rays. The contribution of such sources to the cosmic gamma-ray background is computed and it is found that they provide an excellent fit to the entire background spectrum from 3 keV to 10 MeV. Constraints on the physical conditions in these sources are derived based on these results and the possibility of observing such sources with GRO is considered.
Field George B.
Rogers Robert D.
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