The sloan digital sky survey quasar catalog. IV. Fifth data release

Donald P. Schneider, Patrick B. Hall, Gordon T. Richards, Michael A. Strauss, Daniel E. Vanden Berk, Scott F. Anderson, W. N. Brandt, F. A.N. Xiaohui, Sebastian Jester, J. I.M. Gray, James E. Gunn, Mark U. SubbaRao, Anirudda R. Thakar, Chris Stoughton, Alexander S. Szalay, Brian Yanny, Donald G. York, Neta A. Bahcall, J. Barentine, Michael R. BlantonHoward Brewington, J. Brinkmann, Robert J. Brunner, Francisco J. Castander, István Csabai, Joshua A. Frieman, Masataka Fukugita, Michael Harvanek, David W. Hogg, Željko Ivezić, Stephen M. Kent, S. J. Kleinman, G. R. Knapp, Richard G. Kron, Jurek Krzesiński, Daniel C. Long, Robert H. Lupton, Atsuko Nitta, Jeffrey R. Pier, David H. Saxe, Yue Shen, Stephanie A. Snedden, David H. Weinberg, Jian Wu

Research output: Contribution to journalArticlepeer-review

392 Scopus citations


We present the fourth edition of the Sloan Digital Sky Survey (SDSS) Quasar Catalog. The catalog contains 77,429 objects; this is an increase of over 30,000 entries since the previous edition. The catalog consists of the objects in the SDSS Fifth Data Release that have luminosities larger than Mi = -22.0 (in a cosmology with H0 = 70 km s-1 Mpc -1, ΩM = 0.3, and ΩΛ = 0.7), have at least one emission line with FWHM larger than 1000 km s-1 or have interesting/complex absorption features, are fainter than i ≈15.0, and have highly reliable redshifts. The area covered by the catalog is ≈5740 deg2. The quasar redshifts range from 0.08 to 5.41, with a median value of 1.48; the catalog includes 891 quasars at redshifts greater than 4, of which 36 are at redshifts greater than 5. Approximately half of the catalog quasars have i < 19; nearly all have i < 21. For each object the catalog presents positions accurate to better than 0.2" rms per coordinate, five-band (ugriz) CCD-based photometry with typical accuracy of 0.03 mag, and information on the morphology and selection method. The catalog also contains basic radio, near-infrared, and X-ray emission properties of the quasars, when available, from other large-area surveys. The calibrated digital spectra cover the wavelength region 3800-9200 Å at a spectral resolution of ≃2000; the spectra can be retrieved from the public database using the information provided in the catalog. The average SDSS colors of quasars as a function of red-shift, derived from the catalog entries, are presented in tabular form. Approximately 96% of the objects in the catalog were discovered by the SDSS.

Original languageEnglish (US)
Pages (from-to)102-117
Number of pages16
JournalAstronomical Journal
Issue number1
StatePublished - Jul 2007

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Catalogs
  • Quasars: general
  • Surveys


Dive into the research topics of 'The sloan digital sky survey quasar catalog. IV. Fifth data release'. Together they form a unique fingerprint.

Cite this