Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975mnras.170..199r&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 170, Jan. 1975, p. 199-217.
Astronomy and Astrophysics
Astronomy
34
Background Radiation, Extragalactic Radio Sources, Galactic Clusters, Radiant Flux Density, X Ray Sources, Quasars, Radio Galaxies, Red Shift, Seyfert Galaxies, Tables (Data)
Scientific paper
Identifications with a relatively complete sample of high-latitude X-ray sources, including four new identifications with Abell clusters, are used to establish the luminosity function for extragalactic sources, and to determine the maximum rates of evolution for different populations of source consistent with the observed integrated X-ray background. A significant limit is obtained on any evolution that operates on all sources. Without evolution, quasars, and radio and normal galaxies make a negligible contribution to the background. Seyferts may contribute about 30%, but with an uncertainty of the same order. Rich clusters contribute about 10%, but make up over 80% of the identifications. Both inverse Compton and thermal bremsstrahlung models of cluster sources are investigated, and severe restrictions can be placed on models of Silk and Tarter (1973), in which a strong correlation of X-ray luminosity with richness is predicted.
Fabian Andrea C.
Rowan-Robinson Michael
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