A Caltech Library Service

A CFH12k lensing survey of X-ray luminous galaxy clusters. II. Weak lensing analysis and global correlations

Bardeau, S. and Soucail, G. and Kneib, J.-P. and Czoske, Oliver and Ebeling, H. and Hudelot, P. and Smail, I. and Smith, G. P. (2007) A CFH12k lensing survey of X-ray luminous galaxy clusters. II. Weak lensing analysis and global correlations. Astronomy and Astrophysics, 470 (2). pp. 449-466. ISSN 0004-6361. doi:10.1051/0004-6361:20077443.

PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


Aims. We present a wide-field multi-color survey of a homogeneous sample of eleven clusters of galaxies for which we measure total masses and mass distributions from weak lensing. This sample, spanning a small range in both X-ray luminosity and redshift, is ideally suited to determining the normalisation of scaling relations between X-ray properties of clusters and their masses (the M − T_X and the M − L_X relations) and also estimating the scatter in these relations at a fixed luminosity. Methods. The eleven clusters in our sample are all X-ray luminous and span a narrow redshift range at z = 0.21 ± 0.04. The weak lensing analysis of the sample is based on ground-based wide-field imaging obtained with the CFH12k camera on CFHT. We use the methodology developed and applied previously on the massive cluster Abell 1689. A Bayesian method, implemented in the Im2shape software, is used to fit the shape parameters of the faint background galaxies and to correct for PSF smearing. A multi-color selection of the background galaxies is applied to retrieve the weak lensing signal, resulting in a background density of sources of ~10 galaxies per square arc minute. With the present data, shear profiles are measured in all clusters out to at least 2 Mpc (more than 15 from the center) with high confidence. The radial shear profiles are fitted with different parametric mass profiles and the virial mass M_(200) is estimated for each cluster and then compared to other physical properties. Results. Scaling relations between mass and optical luminosity indicate an increase of the M/L ratio with luminosity (M/L ∝ L^(0.8)) and a LX−M_(200) relation scaling as L_X ∝ M^(0.83±0.11)_(200) while the normalization of the M_(200) ∝ T^(3/2)_X relation is close to the one expected from hydrodynamical simulations of cluster formation as well as previous X-ray analyses. We suggest that the dispersion in the M_(200) − T_X and M_(200) − L_X relations reflects the different merging and dynamical histories for clusters of similar X-ray luminosities and intrinsic variations in their measured masses. Improved statistics of clusters over a wider mass range are required for a better control of the intrinsic scatter in scaling relations.

Item Type:Article
Related URLs:
URLURL TypeDescription
Kneib, J.-P.0000-0002-4616-4989
Smail, I.0000-0003-3037-257X
Smith, G. P.0000-0003-4494-8277
Additional Information:© ESO 2007. Received 9 March 2007. Accepted 9 May 2007. We are grateful to Sarah Bridle and Phil Marshall for many interactions and helpful discussions, especially regarding Im2shape and LensEnt2, their distribution and their use. The referee Thomas Reiprich helped us improve the paper by a lot of useful comments. We wish to thank CALMIP (CALcul en MIdi-Pyrénées) for making data-processing resources available during the last quarter of 2002 for this CPU-time and RAM consuming analysis. We also thank the Programme National de Cosmologie of the CNRS for financial support. J.P.K. acknowledges support from CNRS and Caltech. I.R.S. and G.P.S. acknowledge support from the Royal Society.
Funding AgencyGrant Number
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Subject Keywords:gravitational lensing; dark matter; galaxies : clusters : general
Issue or Number:2
Record Number:CaltechAUTHORS:20091016-114511616
Persistent URL:
Official Citation:A CFH12k lensing survey of X-ray luminous galaxy clusters - II. Weak lensing analysis and global correlations S. Bardeau, G. Soucail, J.-P. Kneib, O. Czoske, H. Ebeling, P. Hudelot, I. Smail and G. P. Smith A&A 470 (2) 449-466 (2007) DOI: 10.1051/0004-6361:20077443
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:16365
Deposited By: Tony Diaz
Deposited On:26 Oct 2009 17:41
Last Modified:08 Nov 2021 23:26

Repository Staff Only: item control page