http://authors.library.caltech.edu/14145/1/OGUaj08.pdf
Oguri, Masamune and Inada, Naohisa and Strauss, Michael A. and Kochanek, Christopher S. and Richards, Gordon T. and Schneider, Donald P. and Becker, Robert H. and Fukugita, Masataka and Gregg, Michael D. and Hall, Patrick B. and Hennawi, Joseph F. and Johnston, David E. and Kayo, Issha and Keeton, Charles R. and Pindor, Bartosz and Shin, Min-Su and Turner, Edwin L. and White, Richard L. and York, Donald G. and Anderson, Scott F. and Bahcall, Neta A. and Brunner, Robert J. and Burles, Scott and Castander, Francisco J. and Chiu, Kuenley and Clocchiatti, Alejandro and Eisenstein, Daniel and Frieman, Joshua A. and Kawano, Yozo and Lupton, Robert and Morokuma, Tomoki and Rix, Hans-Walter and Scranton, Ryan and Sheldon, Erin Scott (2008) The Sloan Digital Sky Survey Quasar Lens Search. III. Constraints on dark energy from the third data release quasar lens catalog. Astronomical Journal, 135 (2). pp. 512-519. ISSN 0004-6256 http://resolver.caltech.edu/CaltechAUTHORS:20090504-105118535
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1.0
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Final
Descripción
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.
