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Title:
Radio-Selected Quasars in the Sloan Digital Sky Survey
Authors:
McGreer, Ian D.; Helfand, David J.; White, Richard L.
Affiliation:
AA(Department of Astronomy, Columbia University, Pupin Physics Laboratories, New York, NY 10027, USA ), AB(Department of Astronomy, Columbia University, Pupin Physics Laboratories, New York, NY 10027, USA ), AC(Space Telescope Science Institute, Baltimore, MD 21218, USA)
Publication:
The Astronomical Journal, Volume 138, Issue 6, pp. 1925-1937 (2009). (AJ Homepage)
Publication Date:
12/2009
Origin:
IOP
AJ Keywords:
quasars: general
DOI:
10.1088/0004-6256/138/6/1925
Bibliographic Code:
2009AJ....138.1925M

Abstract

We have conducted a pilot survey for z > 3.5 quasars by combining the FIRST radio survey with the Sloan Digital Sky Survey (SDSS). While SDSS already targets FIRST sources for spectroscopy as quasar candidates, our survey includes fainter quasars and greatly improves the discovery rate by using strict astrometric criteria for matching the radio and optical positions. Our method allows for selection of high-redshift quasars with less color bias than with optical selection, as using radio selection essentially eliminates stellar contamination. We report the results of spectroscopy for 45 candidates, including 29 quasars in the range 0.37 < z < 5.2, with 7 having redshifts z > 3.5. We compare quasars selected using radio and optical criteria, and find that radio-selected quasars have a much higher fraction of moderately reddened objects. We derive a radio-loud quasar luminosity function at 3.5 < z < 4.0, and find that it is in good agreement with expectations from prior SDSS results.
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