NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-20 T07:53:50 PDT
Help | Comment | NED Home

For refcode 2007A&A...470..449B:
Retrieve 11 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by European Southern Observatory (ESO). Reproduced by permission
2007A&A...470..449B A CFH12k lensing survey of X-ray luminous galaxy clusters. II. Weak lensing analysis and global correlations Bardeau, S.; Soucail, G.; Kneib, J.-P.; Czoske, O.; Ebeling, H.; Hudelot, P.; Smail, I.; Smith, G. P. Abstract. 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 is proportional to L^0.8^) and a L_X_-M_200_ relation scaling as L_X_ is proportional to M_200_^0.83 +/- 0.11^ while the normalization of the M_200_ is proportional to T_X_^3/2^ 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. Key words: gravitational lensing, dark matter, galaxies: clusters: general
Retrieve 11 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home