The X-ray background and the evolution of quasars

Details The X-ray background and the evolution of quasars The X-ray background and the evolution of quasars

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...308...53t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 308, Sept. 1, 1986, p. 53-58.

Astronomy and Astrophysics

Astrophysics

7

Cosmology, Galactic Evolution, Quasars, X Ray Sources, Active Galaxies, Background Radiation, Galactic Nuclei, Luminosity, Seyfert Galaxies, X Ray Spectra

Scientific paper

The authors compute the contribution to the 2 - 10 keV X-ray background due to quasars and active galaxies, assuming that the X-ray luminosity of an individual quasar changes as dL/dt = ALα. The continuity equation is applied to the quasar population, constrained by the average volume emissivity of the diffuse X-ray background and by current epoch observations of the luminosity function. It is found that quasars produce too much X-ray background radiation unless α > 1.2.

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