Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....108.1542p&link_type=abstract
The Astronomical Journal (ISSN 0004-6256), vol. 108, no. 5, p. 1542-1547
Astronomy and Astrophysics
Astronomy
17
Active Galactic Nuclei, Light (Visible Radiation), Quasars, Rosat Mission, Sky Surveys (Astronomy), Stellar Luminosity, Stellar Spectra, X Ray Astronomy, X Ray Spectra, Astronomical Spectroscopy, Background Radiation, Proportional Counters, Red Shift, Regression Analysis, Stellar Radiation
Scientific paper
Successful pointed observations using the Roentgen Satellite (ROSAT) Position Sensitive Proportional Counter (PSPC) were made of seven z greater than 3 optically selected quasars from the Large Bright Quasar Survey (LBQS). Four detections and three 3 sigma upper limits resulted. Combining these data with the heterogeneous sample of Avni & Tananbaum (1986) confirms their conclusion that the ratio of x-ray to optical luminosity is correlated with optical luminosity and probably not correlated with redshift. This suggests that x-ray luminosity evolves more slowly than optical luminosity. These results are then used in conjunction with the LBQS database to estimate the contribution to the 2 keV x-ray background of bright, optically selected quasars with mB(sub J) less than 18.85; the result is about 5%.
Foltz Craig B.
Impey Chris David
Pickering Timothy E.
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