The Sloan Digital Sky Survey Quasar Lens Search. V. Final catalog from the seventh data release

Naohisa Inada, Masamune Oguri, Min Su Shin, Issha Kayo, Michael A. Strauss, Tomoki Morokuma, Cristian E. Rusu, Masataka Fukugita, Christopher S. Kochanek, Gordon T. Richards, Donald P. Schneider, Donald G. York, Neta A. Bahcall, Joshua A. Frieman, Patrick B. Hall, Richard L. White

Research output: Contribution to journalArticlepeer-review

128 Scopus citations


We present the final statistical sample of lensed quasars from the Sloan Digital Sky Survey (SDSS) Quasar Lens Search (SQLS). The well-defined statistical lens sample consists of 26 lensed quasars brighter than i = 19.1 and in the redshift range of 0.6 < z < 2.2 selected from 50,826 spectroscopically confirmed quasars in the SDSS Data Release 7 (DR7), where we restrict the image separation range to 1″ < θ < 20″ and the i-band magnitude differences in two images to be smaller than 1.25mag. The SDSS DR7 quasar catalog also contains 36additional lenses identified with various techniques. In addition to these lensed quasars, we have identified 81 pairs of quasars from follow-up spectroscopy, 26 of which are physically associated binary quasars. The statistical lens sample covers a wide range of image separations, redshifts, and magnitudes, and therefore is suitable for systematic studies of cosmological parameters and surveys of the structure and evolution of galaxies and quasars.

Original languageEnglish (US)
Article number119
JournalAstronomical Journal
Issue number5
StatePublished - May 2012

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • cosmology: observations
  • gravitational lensing: strong
  • quasars: general


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