X-ray studies of quasars with the Einstein Observatory. II

Details X-ray studies of quasars with the Einstein Observatory. II X-ray studies of quasars with the Einstein Observatory. II

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...245..357z&link_type=abstract

Astrophysical Journal, Part 1, vol. 245, Apr. 15, 1981, p. 357-374. Research supported by the U.S.-Israel Binational Science Fo

Astronomy and Astrophysics

Astronomy

456

Cosmology, Heao 2, Quasars, Spaceborne Astronomy, X Ray Sources, Astronomical Models, Background Radiation, Light Emission, Luminosity, Red Shift, Tables (Data)

Scientific paper

X-ray observations of 107 quasars have been carried out with the Einstein Observatory, and 79 have been detected. A correlation between optical emission and X-ray emission is found; and for radio-loud quasars, the data show a correlation between radio emission and X-ray emission. For a given optical luminosity, the average X-ray emission of radio-loud quasars is about three times higher than that of radio-quiet quasars. The data also suggest that the ratio of X-ray to optical luminosity is decreasing with increasing redshift and/or optical luminosity. The data support the picture in which luminosity evolution, rather than pure density evolution, describes the quasar behavior as a function of redshift.

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