Abstract
Clusters of galaxies play a fundamental role in testing models of cosmic structure formation and constraining the properties of dark matter (DM). In this talk, I will present new results from a full-lensing analysis of twenty X-ray hot clusters (Tx>5keV) selected from the CLASH survey. Our analysis uses wide-field multi-color imaging, taken primarily with Suprime-Cam on the Subaru Telescope, and deep 16-band near-UV, optical , and near-IR photometry with the Hubble Space Telescope.
We obtain mass profiles of individual clusters from a joint likelihood analysis of strong-lensing, weak-lensing shear-and-magnification measurements, for a comparison with LCDM predictions of cluster-sized DM halo properties. We show that the halo concentration-mass relation derived from our full-lensing analysis is in excellent agreement with LCDM predictions when the CLASH X-ray selection function and projection effects are taken into account. The ensemble-averaged, stacked total mass profile of the CLASH sample is shown to be consistent with halo model predictions in the LCDM cosmology, characterized by the inner cusp slope dln(rho)/dln(r)=-1.17 ± 0.17, halo concentration c200=3.7 ± 0.3, halo mass M200=(1.2 ± 0.1) 1015 Msun, and linear halo bias bh ≃ 9 at a mean cluster redshift of
Coffee and tea will be served 20 minutes prior to the seminar.