The contribution of quasars to the cosmic X-ray background

Details The contribution of quasars to the cosmic X-ray background The contribution of quasars to the cosmic X-ray background

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...267...11z&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 267, no. 1, p. 11-20.

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Astronomical Spectroscopy, Cosmic X Rays, Quasars, X Ray Astronomy, Computational Astrophysics, Distribution (Property)

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The contribution of QSOs to the cosmic X-ray background (CXB) is calculated by adopting a reasonable total evolution function and a determined functional relationship between the X-ray and the optical luminosities for optically selected QSOs. The sensitivity of the contribution to the deceleration parameter, the optical and X-ray spectral indices, and the other parameters in the X-ray evolution function is determined. The calculated values are compared with the results of cumulative X-ray counts of QSOs. The contribution of QSO and AGNs with M less than -10.5 m is found to be about 10 percent and 30-60 percent to the CXB at 2 keV, respectively.

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