We use galaxy groups selected from the Sloan Digital Sky Survey (SDSS) together with mass models for individual groups to study the galaxy-galaxy lensing signals expected from galaxies of different luminosities and morphological types. We compare our model predictions with the observational results obtained from the SDSS by Mandelbaum et al. (2006) for the same samples of galaxies. The observational results are well reproduced in a ΛCDM model based on the WMAP 3-year data, but a ΛCDM model with higher σ8, such as the one based on the WMAP 1-year data,significantly over-predicts the galaxy-galaxy lensing signal. We model, separately, the contributions to the galaxy-galaxy lensing signals from different galaxies: central versus satellite, early-type versus late-type, and galaxies in halos of different masses. We also examine how the predicted galaxy-galaxy lensing signal depends on the shape, density profile, and the location of the central galaxy with respect to its host halo.
@article{arxiv.0807.4934,
title = {Modeling Galaxy-Galaxy Weak Lensing with SDSS Groups},
author = {Ran Li and H. J. Mo and Zuhui Fan and Marcello Cacciato and Frank C. van den Bosch and Xiaohu Yang and Surhud More},
journal= {arXiv preprint arXiv:0807.4934},
year = {2009}
}
Comments
16 pages, 8 figures, accepted for publication on MNRAS