The sloan digital sky survey quasar lens search. III. Constraints on dark energy from the third data release quasar lens catalog

Masamune Oguri, Naohisa Inada, Michael A. Strauss, Christopher S. Kochanek, Gordon T. Richards, Donald P. Schneider, Robert H. Becker, Masataka Fukugita, Michael D. Gregg, Patrick B. Hall, Joseph F. Hennawi, David E. Johnston, Issha Kayo, Charles R. Keeton, Bartosz Pindor, Min Su Shin, Edwin L. Turner, Richard L. White, Donald G. York, Scott F. AndersonNeta A. Bahcall, Robert J. Brunner, Scott Burles, Francisco J. Castander, Kuenley Chiu, Alejandro Clocchiatti, Daniel Eisenstein, Joshua A. Frieman, Yozo Kawano, Robert Lupton, Tomoki Morokuma, Hans Walter Rix, Ryan Scranton, Erin Scott Sheldon

Research output: Contribution to journalArticlepeer-review

81 Scopus citations


We present cosmological results from the statistics of lensed quasars in the Sloan Digital Sky Survey (SDSS) Quasar Lens Search. By taking proper account of the selection function, we compute the expected number of quasars lensed by early-type galaxies and their image separation distribution assuming a flat universe, which is then compared with seven lenses found in the SDSS Data Release 3 to derive constraints on dark energy under strictly controlled criteria. For a cosmological constant model (w = -1) we obtain ΩΛ = 0.74+0.11 -0.15(stat.) +0.13 -0.06(syst.). Allowing w to be a free parameter we find ΩM = 0.26+0.07 -0.06(stat.) +0.03 -0.05(syst.) and w = -1.1 0.6(stat.)+0.3 -0.5(syst.) when combined with the constraint from the measurement of baryon acoustic oscillations in the SDSS luminous red galaxy sample. Our results are in good agreement with earlier lensing constraints obtained using radio lenses, and provide additional confirmation of the presence of dark energy consistent with a cosmological constant, derived independently of type Ia supernovae.

Original languageEnglish (US)
Pages (from-to)512-519
Number of pages8
JournalAstronomical Journal
Issue number2
StatePublished - Feb 1 2008

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Cosmological parameters ? cosmology: theory ? gravitational lensing


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