Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...243....5c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 243, no. 1, March 1991, p. 5-15.
Astronomy and Astrophysics
Astronomy
12
Active Galactic Nuclei, Black Holes (Astronomy), Intergalactic Media, Relic Radiation, X Ray Sources, Compton Effect, Electron Energy, Red Shift
Scientific paper
Attention is given to the recent Cobe observation which rules out the hot intergalactic model for the X-ray background (XRB) and the possibility that the XRB is due to discrete sources emitting at high redshifts of about 10. Thus, the intergalactic medium, even if it contains all the baryonic density of the universe, is heated and ionized by Compton scattering and subsequent thermalization of the high-energy electrons. In the framework of the accretion model of active galactic nuclei, currently inactive galaxies must harbor massive black holes, having an average mass of about 10 to the 7th solar masses. Therefore, it is considered that the whole formation period of the black holes is not observed, but nevertheless is radiation-emitting. The black holes would thus account for the XRB, and their surface density would be greater than the limit set by fluctuation analysis.
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