Journal article

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 Anderson Show all

ASTRONOMICAL JOURNAL | IOP PUBLISHING LTD | Published : 2008

Abstract

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 comb..

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