X-ray quasars and the X-ray background

Details X-ray quasars and the X-ray background X-ray quasars and the X-ray background

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.198..921k&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 198, Mar. 1982, p. 921-934.

Astronomy and Astrophysics

Astronomy

26

Background Radiation, Quasars, Radio Emission, Stellar Luminosity, X Ray Sources, Flattening, Radiant Flux Density, Radio Sources (Astronomy), Stellar Magnitude

Scientific paper

The Einstein X-ray observations of a sample of 202 radio- and optically-selected quasars due to Ku, Helfand and Lucy (1980) and to Zamorani et al. (1981) are analyzed. Correlations between X-ray, optical and radio luminosities are examined. The contribution of radio-loud quasars to the 2-keV X-ray background is estimated using high-frequency radio-source counts, and the contribution due to radio-quiet, optically bright quasars using optical counts. It is shown that radio-loud quasars and radio-quiet optically bright quasars together contribute about 15 percent of the observed 2-keV X-ray background. The contribution of optically faint radio-quiet quasars is uncertain, but may be limited to a maximum of approximately 30 percent if recent indications of a flattening in optical counts at faint magnitudes are correct.

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