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25 April 2024

» arxiv » astro-ph/0103029

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Weak Lensing Measurements of 42 SDSS/RASS Galaxy Clusters
Erin Scott Sheldon ; James Annis ; Hans Bohringer ; Philippe Fischer ; Joshua A. Frieman ; Michael Joffre ; David Johnston ; Timothy A. McKay ; Christopher Miller ; Robert C. Nichol ; Albert Stebbins ; Wolfgang Voges ; Scott F. Anderson ; Neta A. Bahcall ; J. Brinkmann ; Robert Brunner ; Istvan Csabai ; Masataka Fukugita ; G. S. Hennessy ; Zeljko Ivezic ; Robert H. Lupton ; Jeffrey A. Munn ; Jeffrey R. Pier ; Donald G. York ;
Date:	2 Mar 2001
Journal:	Astrophys.J. 554 (2001) 881-887
Subject:	astro-ph
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.
Source:	arXiv, astro-ph/0103029
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