Weak Lensing Measurements of 42 SDSS/RASS Galaxy Clusters
Abstract
We present a lensing study of 42 galaxy clusters imaged in Sloan Digital Sky Survey (SDSS) commissioning data. Cluster candidates are selected optically from SDSS imaging data and confirmed for this study by matching to X-ray sources found independently in the ROSAT all sky survey (RASS). Five color SDSS photometry is used to make accurate photometric redshift estimates that are used to rescale and combine the lensing measurements. The mean shear from these clusters is detected to 2 h-1 Mpc at the 7-sigma level, corresponding to a mass within that radius of 4.2 +/- 0.6 x 10^14 h-1 M_sun. The shear profile is well fit by a power law with index -0.9 +/- 0.3, consistent with that of an isothermal density profile. This paper demonstrates our ability to measure ensemble cluster masses from SDSS imaging data.
Cite
@article{arxiv.astro-ph/0103029,
title = {Weak Lensing Measurements of 42 SDSS/RASS Galaxy Clusters},
author = {Erin Scott Sheldon and James Annis and Hans Bohringer and Philippe Fischer and Joshua A. Frieman and Michael Joffre and David Johnston and Timothy A. McKay and Christopher Miller and Robert C. Nichol and Albert Stebbins and Wolfgang Voges and Scott F. Anderson and Neta A. Bahcall and J. Brinkmann and Robert Brunner and Istvan Csabai and Masataka Fukugita and G. S. Hennessy and Zeljko Ivezic and Robert H. Lupton and Jeffrey A. Munn and Jeffrey R. Pier and Donald G. York},
journal= {arXiv preprint arXiv:astro-ph/0103029},
year = {2009}
}
Comments
14 pages, 7 figures, Accepted for publication in ApJ