Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-11-18
Astrophys.J.652:26-42,2006
Astronomy and Astrophysics
Astrophysics
18 pages, 10 figures, accepted for publication in The Astrophysical Journal
Scientific paper
10.1086/507591
Galaxy-galaxy lensing measures the mean excess surface density DS(r) around a sample of lensing galaxies. We develop a method for combining DS(r) with the galaxy correlation function xi_gg(r) to constrain Omega_m and sigma_8, going beyond the linear bias model to reach the level of accuracy demanded by current and future measurements. We adopt the halo occupation distribution (HOD) framework, and we test its applicability to this problem by examining the effects of replacing satellite galaxies in the halos of an SPH simulation with randomly selected dark matter particles from the same halos. The difference between dark matter and satellite galaxy radial profiles has a ~10% effect on DS(r) at r<1 Mpc/h. However, if radial profiles are matched, the remaining impact of individual subhalos around satellite galaxies and environmental dependence of the HOD at fixed halo mass is <5% in DS(r) for 0.1
Dav'e Romeel
Katz Neal
Tinker Jeremy L.
Weinberg David H.
Yoo Jaiyul
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