On the cosmological evolution of the X-ray emission from quasars

Details On the cosmological evolution of the X-ray emission from quasars On the cosmological evolution of the X-ray emission from quasars

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...262l..17a&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 262, Nov. 15, 1982, p. L17-L21.

Mathematics

Logic

120

Cosmology, Quasars, Radiant Flux Density, X Ray Sources, Astronomical Models, Background Radiation, Data Sampling, Luminous Intensity

Scientific paper

The average dependence of the ratio of X-ray luminosity to optical luminosity as a function of redshift and optical luminosity for quasars is derived, and it is found that the explicit dependence of this ratio is predominantly on optical luminosity. For a wide class of models for the cosmological evolution of quasars, the results imply that the evolution of the X-ray luminosity function is weaker than the evolution of the optical luminosity function. Implications for physical models of quasars and for global properties of the quasar population are indicated.

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