Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981nyasa.375..235f&link_type=abstract
(AAS, American Physical Society, NASA, et al., Texas Symposium on Relativistic Astrophysics, 10th, Baltimore, MD, Dec. 15-19, 19
Astronomy and Astrophysics
Astronomy
16
Astronomical Spectroscopy, Background Radiation, Gamma Ray Astronomy, Red Shift, X Ray Astronomy, Active Galaxies, Black Holes (Astronomy), Compton Effect, Galactic Clusters, Intergalactic Media, Inverse Scattering, Quasars
Scientific paper
The spectrum of the extragalactic X-ray and gamma-ray backgrounds, originating in a redshift of about 3.0, provides a measurement of the integrated X- and gamma-ray evolution of known sources such as clusters of galaxies, active galaxies, and quasars. It also limits possible new classes of sources, such as accreting black holes and a hot intergalactic medium. Attention is given to the contribution to the X- and gamma-ray backgrounds of known evolved and unevolved sources, as well as the character of small scale and large scale fluctuations in the X-ray background. Speculations as to the origin of the X- and gamma-ray background include such possibilities as the inverse Compton scattering of microwave background photons by intergalactic cosmic-ray electrons, accretion of the intergalactic medium onto pregalactic black holes, and matter-antimatter annihilation in a baryon-symmetric universe.
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