X-ray properties of quasars and results from a deep X-ray survey of optically selected objects

Details X-ray properties of quasars and results from a deep X-ray survey of optically selected objects X-ray properties of quasars and results from a deep X-ray survey of optically selected objects

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...297..177k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 297, Oct. 1, 1985, p. 177-193.

Astronomy and Astrophysics

Astrophysics

75

Luminosity, Quasars, Seyfert Galaxies, Visible Spectrum, X Ray Sources, Distribution Functions, Heao 2, Nonthermal Radiation, Radiant Flux Density, Red Shift

Scientific paper

The authors study a sample of 178 optically selected quasars and Seyfert galaxies, 77 of which have measured X-ray fluxes while the remainder have upper limits. The sample includes 23 new high-redshift (z > 1), "grism-selected" quasars from two fields. The authors observed each field with the IPC on the Einstein Observatory and detected X-rays from nine of the quasars. The X-ray luminosities of these objects lie in the range (1 - 9)×1045ergs s-1. These results show that "typical" radio-quiet quasars are indeed powerful X-ray sources. The authors investigate the distribution function describing the dependence of the X-ray-to-optical luminosity ratio on redshift and optical luminosity with both nonparametric and parametric methods. The analysis confirms the conclusion that the X-ray-to-optical luminosity ratio decreases with increasing optical luminosity. The dependence of the ratio on look-back time is smaller and may be nonexistent. It is also shown that the properties of a complete sample of X-ray selected quasars are not commensurate with the present results for optically selected quasars.

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