J/ApJ/462/614 J/ApJ/462/614 A deep multicolor survey. II. P B Hall P S Osmer R F Green A C Porter S J Warren Astrophys. J. 462 614 1996 1996ApJ...462..614H J/ApJS/104/185 : A deep multicolor survey. I. (Hall+ 1996) Galaxies, photometry QSOs Surveys catalogs galaxies: photometry quasars: general surveys We have used the Kitt Peak National Observatory 4m Mayall telescope to image 0.83 square degrees of sky in six fields at high galactic latitude in six filters spanning 3000-10000A to magnitude limits ranging from 22.1 to 23.8. As a first use of this database, we have conducted a multicolor survey for quasars. We discuss various methods of selecting outliers in different color-color diagrams and multicolor space that have been used to identify quasars at all redshifts from their colors alone. We discuss the initial results of our program of spectroscopic identification which has so far resulted in the identification of over 40 faint quasars, including one a z>4, a similar number of compact narrow emission-line galaxies, and a number of unusual and potentially interesting stars. We use these spectroscopic results, along with extensive simulations of quasar spectra, to study the efficiency of our candidate selection procedures. Finally, we compare the number counts of our quasars and quasar candidates to the expected numbers based on previous studies of the quasar luminosity function. The agreement of our observations with these expectations is good in most cases. However, we do estimate that our survey contains more quasars with B<21 and z<2.3 than expected from the results published by Koo & Kron in (1988ApJ...325...92K) and more z>3 quasars than expected from the results published by Warren, Hewett & Osmer in (1994ApJ...421..412W), both at the 3 {sigma} level. Additional spectroscopic observations will be required to confirm or refute these excesses.

No Sequential number --- Name DMS or N designation number=1 DMS followed by the epoch 1950.0 position in table1, N followed by the epoch 1950.0 position in table2. --- RAh Right ascension (1950.0) h RAm Right ascension (1950.0) min RAs Right ascension (1950.0) s DE- Declination sign --- DEd Declination (1950.0) deg DEm Declination (1950.0) arcmin DEs Declination (1950.0) arcsec Bmag B magnitude mag z Redshift --- u_z Uncertainty flag on z --- Notes Notes --- table1.texLaTeX version of table1 table2.texLaTex Version of table2 Patricia Bauer CDS 1996Oct03Pat Hall <pathall@as.arizona.edu> J_ApJ_462_614.xml