The US Survey and the Incidence of Bright Quasars

Details The US Survey and the Incidence of Bright Quasars The US Survey and the Incidence of Bright Quasars

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aj....120.1683u&link_type=abstract

The Astronomical Journal, Volume 120, Issue 4, pp. 1683-1690.

Astronomy and Astrophysics

Astronomy

2

Galaxies: Quasars: Emission Lines, Galaxies: Quasars: General, Surveys

Scientific paper

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 fields. 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 satisfies criteria on absolute magnitude MB<-23.0 (where H0=50) and z>0.3. These subsets and others defined by other morphological criteria currently in use confirm the high incidence of bright US survey quasars previously established with the MB criterion alone. The number count data and the redshift distribution for the bright quasars of the UBQS are found to agree with those of the Hamburg ESO (HES) and Edinburgh quasar surveys (EQS). The number counts in the range 15.5

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