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Title:
Photometric Quasars: The One Million Mark and 9-D SDSS+Spitzer Selection
Authors:
Richards, Gordon T.; Myers, A.; Brunner, R.; Strand, N.; Nichol, R.; Gray, A.; Riegel, R.; Lacy, M.; Szalay, A.
Affiliation:
AA(Drexel Univ), AB(University of Illinois), AC(University of Illinois), AD(University of Illinois), AE(Portsmouth, United Kingdom), AF(Georgia Tech), AG(Georgia Tech), AH(SSC), AI(Johns Hopkins)
Publication:
American Astronomical Society, AAS Meeting #211, #142.02; Bulletin of the American Astronomical Society, Vol. 39, p.994
Publication Date:
12/2007
Origin:
AAS
Bibliographic Code:
2007AAS...21114202R

Abstract

We describe a photometrically selected catalog that includes 1,175,097 unresolved quasar candidates to i=21 from 8417 sq. deg. of imaging from the Sloan Digital Sky Survey's (SDSS) Data Release 6. With an expected efficiency in excess of 95% for 17<i<20; and an overall efficiency of 85.6%, the catalog is expected to contain approximately 1 million quasars. We further discuss the optimal selection and photometric redshift estimation of quasars from combined SDSS plus Spitzer-IRAC photometry. Using only the deeper 3.6 and 4.5 micron bands of Spitzer-IRAC and single epoch SDSS photometry, we reliably identify 2580 quasar candidates in the Spitzer FLS, ELAIS-N1/N2, and Lockman Hole fields --- roughly a density of 110 per square degree and 10 times the density of the SDSS spectroscopic sample. Photometric redshifts are estimated to be accurate to 4 percent or better for 86 percent of the sample.
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