A search for intermediate-redshift quasars has been carried out with slitless spectroscopy in the central 21.07 sq deg of the SA 94, where the existence of a large database of objects for which slit spectroscopy was already available provided a valuable opportunity of testing the properties of the present selection technique. Fifty candidates have been observed with slit spectroscopy, confirming 34 quasars and two H II galaxies. The completeness of this survey as a function of magnitude and redshift has been analyzed, and an effective area of 16.9 sq deg has been evaluated. The estimated quasar surface density for QSOs with z between 1.8 and 3.2 and B less than 19.4 is 1.4 + or - 0.3/sq deg, in agreement with other surveys in the literature.
A complete quasar sample at intermediate redshift
BARBIERI, CESARE;
1991
Abstract
A search for intermediate-redshift quasars has been carried out with slitless spectroscopy in the central 21.07 sq deg of the SA 94, where the existence of a large database of objects for which slit spectroscopy was already available provided a valuable opportunity of testing the properties of the present selection technique. Fifty candidates have been observed with slit spectroscopy, confirming 34 quasars and two H II galaxies. The completeness of this survey as a function of magnitude and redshift has been analyzed, and an effective area of 16.9 sq deg has been evaluated. The estimated quasar surface density for QSOs with z between 1.8 and 3.2 and B less than 19.4 is 1.4 + or - 0.3/sq deg, in agreement with other surveys in the literature.Pubblicazioni consigliate
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