The US Survey and the Incidence of Bright Quasars

Abstract

The bright quasar sample from the US survey (UBQS) comprises 19 quasars with B \ 16.95 mag selected within the areal completeness boundaries of seven US survey elds. A subset of 17 quasars is statistically complete for objects judged to be starlike on images taken with cameras of the 1.2 m Schmidt class that satisfy the morphological criterion B \ 21[[3/(4z)], where B \ 18.5 mag, at redshift z. Twelve objects compose a statistically complete subset that satises criteria on absolute magnitude (where and z [ 0.3. These subsets and others dened by other morphological cri-M B \ [23.0 H 0 \ 50) teria currently in use conrm the high incidence of bright US survey quasars previously established with the criterion alone. The number count data and the redshift distribution for the bright quasars of the M B UBQS are found to agree with those of the Hamburg ESO (HES) and Edinburgh quasar surveys (EQS).

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