EAS Publications Series
Volume 20, 2006Mass Profiles and Shapes of Cosmological Structures
|Page(s)||269 - 270|
|Published online||19 May 2006|
G.A. Mamon, F. Combes, C. Deffayet and B. Fort (eds)
EAS Publications Series, 20 (2006) 269-270
Mass distribution and Dynamical State of Galaxy Clusters in the LZLS Sample
Departamento de Astronomía, U. de Chile, Casilla 36-D, Santiago
2 Laboratório Nacional de Astrofísica, Itajubá, Brazil
3 U. de São Paulo, Brazil
4 Observatoire de Marseille, France
We use the weak gravitational lensing effect to study the mass distribution of a sample of 50 southern Abell clusters (0.05 < z < 0.3) having LX > 5 × 1044 erg s-1 observed with ESO-VLT under uniform sky conditions and subarsecond (0.6'') image quality. Their dynamical equibrium is assesed through comparison of the clusters mass estimates made by weak-lensing, velocity-dispersions and X-ray techniques. So far, for 24 clusters (Cypriano et al. 2004), we find: a) the center of their mass and light distributions are coincident for 77% of the sample; b) the elongations of the fitted mass profiles and of the light of the cD galaxies generally match with each other; c) although most of the clusters are found to be in dynamical equilibrium, those with TX ≥ 8 keV (or σv ≥ 1120 km s-1) are the discordant ones. The preliminary bright arc statistics for our whole sample (LZLS) suggests the presence of a cut-off at z ~ 0.07 which is qualitatively consistent with predictions done in a ΛCDM cosmology (Meneghetti et al. 2003).
© EAS, EDP Sciences, 2006
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