Radio-Selected Quasars in the Sloan Digital Sky Survey

Details Radio-Selected Quasars in the Sloan Digital Sky Survey Radio-Selected Quasars in the Sloan Digital Sky Survey

2009-09-22

arxiv.org/abs/0909.4091v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

15 pages, 11 figures, accepted for publication in AJ

Scientific paper

We have conducted a pilot survey for z>3.5 quasars by combining the FIRST radio survey with the 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

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