Galaxy-Galaxy Weak Lensing Measurements from SDSS: I. Image Processing and Lensing signals
Abstract
As the first paper in a series on the study of the galaxy-galaxy lensing from Sloan Digital Sky Survey Data Release 7 (SDSS DR7), we present our image processing pipeline that corrects the systematics primarily introduced by the Point Spread Function (PSF). Using this pipeline, we processed SDSS DR7 imaging data in band and generated a background galaxy catalog containing the shape information of each galaxy. Based on our own shape measurements of the galaxy images from SDSS DR7, we extract the galaxy-galaxy (GG) lensing signals around foreground spectroscopic galaxies binned in different luminosity and stellar mass. The overall signals are in good agreement with those obtained by \citet{Mandelbaum2005, Mandelbaum2006} from the SDSS DR4. The results in this paper with higher signal to noise ratio is due to the larger survey area than SDSS DR4, confirm that more luminous/massive galaxies bear stronger GG lensing signal. We also divide the foreground galaxies into red/blue and star forming/quenched subsamples and measured their GG lensing signals, respectively. We find that, at a specific stellar mass/luminosity, the red/quenched galaxies have relatively stronger GG lensing signals than their counterparts especially at large radii. These GG lensing signals can be used to probe the galaxy-halo mass relations and their environmental dependences in the halo occupation or conditional luminosity function framework.
Keywords
Cite
@article{arxiv.1607.05406,
title = {Galaxy-Galaxy Weak Lensing Measurements from SDSS: I. Image Processing and Lensing signals},
author = {Wentao Luo and Xiaohu Yang and Jun Zhang and Dylan Tweed and Liping Fu and H. J. Mo and Frank C. van den Bosch and Chenggang Shu and Ran Li and Nan Li and Xiangkun Liu and Chuzhong Pan and Yiran Wang and Mario Radovich},
journal= {arXiv preprint arXiv:1607.05406},
year = {2017}
}
Comments
19pages, 12 figures ApJ submitted