Photometric selection of quasars from SDSS. II. (Richards+, 2009)

Details Photometric selection of quasars from SDSS. II. (Richards+, 2009) Photometric selection of quasars from SDSS. II. (Richards+, 2009)

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009ycat..21800067r&link_type=abstract

VizieR On-line Data Catalog: J/ApJS/180/67. Originally published in: 2009ApJS..180...67R

Computer Science

Photometry: Sdss, Qsos, Redshifts, Spectroscopy

Scientific paper

We present a catalog of 1172157 quasar candidates selected from the photometric imaging data of the Sloan Digital Sky Survey (SDSS). The objects are all point sources to a limiting magnitude of i=21.3 from 8417deg2 of imaging from SDSS Data Release 6 (DR6). This sample extends our previous catalog by using the latest SDSS public release data and probing both ultraviolet (UV)-excess and high-redshift quasars. While the addition of high-redshift candidates reduces the overall efficiency (quasars:quasar candidates) of the catalog to ~80%, it is expected to contain no fewer than 850000 bona fide quasars, which is ~8 times the number of our previous sample and ~10 times the size of the largest spectroscopic quasar catalog. Cross-matching between our photometric catalog and spectroscopic quasar catalogs from both the SDSS and 2dF survey yields 88879 spectroscopically confirmed quasars. For judicious selection of the most robust UV-excess sources (~500000 objects in all), the efficiency is nearly 97% -more than sufficient for detailed statistical analyses. The catalog's completeness to type 1 (broad-line) quasars is expected to be no worse than 70%, with most missing objects occurring at z<0.7 and 2.5(2 data files).

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