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Cosmological parameters from the SDSS DR5 velocity dispersion function of early-type galaxies through radio-selected lens statistics

被引：33
作者：
Chae, Kyu-Hyun [1 ]
机构：
[1] Sejong Univ, Dept Astron & Space Sci, Seoul 143747, South Korea
来源：
ASTROPHYSICAL JOURNAL | 2007年 / 658卷 / 02期
关键词：
cosmological parameters; galaxies : evolution; galaxies : statistics; gravitational lensing;
D O I：
10.1086/516569
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We improve strong lensing constraints on cosmological parameters in light of the new measurement of the velocity dispersion function of early-type galaxies based on the SDSS DR5 data and recent semianalytical modeling of galaxy formation. Using both the number statistics of the CLASS statistical sample and the image separation distribution of the CLASS and the PANELS radio-selected lenses, we find the cosmological matter density to be Omega(m,0) = 0.25(-0.08)(+0.12) (68% CL) assuming evolutions of galaxies predicted by a semianalytical model of galaxy formation and Omega(m,0) = 0.25(-0.08)(+0.12) assuming no evolution of galaxies for a flat cosmology with an Einstein cosmo logical constant. For a flat cosmology with a generalized dark energy, we find the nonevolving dark energy equation of state w(x) < -1.2 (w(x) < -0.5) at the 68% CL (95% CL).
引用
收藏
页码：L71 / L74
页数：4
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