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The US and Other Optically Selected Bright QSO Samples

Published online by Cambridge University Press:  12 April 2016

Kenneth J. Mitchell  and
Peter D. Usher
Kenneth J. Mitchell
Affiliation:
Science Applications International Corporation, 4600 Powder Mill Rd., Suite 400, Beltsville, MD, 20705-2675
Peter D. Usher
Affiliation:
Dept. of Astronomy and Astrophysics, The Pennsylvania State Univ., University Park, PA 16802

Abstract

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The US Bright Quasar Sample (UBQS) is a color-selected sample of quasars with B < 17 that has been constructed with an eye towards completeness within well-defined selection limits. The redshift distribution of the UBQS shows an interesting spike at z ~ 0.55. The significance of this enhancement increases when the UBQS is combined with other bright quasar samples which also show evidence of high levels of completeness. Reconstitution of this combined bright quasar sample after removal of the emission-line flux from the B magnitudes indicates that the z ~ 0.55 spike is not caused by an emission-line selection bias. Rather, the largest effect of these sample corrections would be to depress the high end of the optical luminosity function that is derivable from this combined sample.

Type
Part 1. Optical Surveys for AGN
Information
International Astronomical Union Colloquium , Volume 184: AGN Surveys , 2002 , pp. 53 - 58
Copyright
Copyright © Astronomical Society of the Pacific 2002

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