Physics
Scientific paper
Jul 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.286...39l&link_type=abstract
Nature, vol. 286, July 3, 1980, p. 39, 40.
Physics
2
Background Radiation, Cosmic X Rays, Diffuse Radiation, Intergalactic Media, Stellar Mass Accretion, X Ray Sources, Bremsstrahlung, Gravitational Collapse, Stellar Luminosity
Scientific paper
The accretion of a cool, low density intergalactic gas onto intergalactic collapsed objects is examined as a possible source of the diffuse cosmic X-ray background. Evidence for an intergalactic gas at a mean density/closure density of 0.1, temperature of 100,000 K and redshift of 2.5 is presented, and it is noted that such gas is too cool to account directly for the observed thermal bremsstrahlung character of the X-ray background. It is shown that if the X-ray background is due to gas accretion, it could be accounted for by a new class of source with X-ray luminosity less than 10 to the 41 erg/sec, density greater than 0.01/cu Mpc and mass between 10 to the 7th and 10 to the 10th solar masses, representing the hot thermal bremsstrahlung of cool gas accreting onto intergalactic black holes in the present epoch
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