(Proposal ID) S10B-059

(PI) Umetsu, Keiichi

(Proposal Title)
A Unique Cluster Mass Profile Dataset from an HST-Subaru Survey Program

(Abstract)
We propose deep BR_cz' imaging with Suprime-Cam of 12 massive clusters of 
galaxies to complete the measurement of the full mass profiles for a sample of 
25 carefully-chosen, lensing-unbiased X-ray clusters (0.15 < z < 0.9; T_X >~ 5 
keV), for which we will carry out a 524-orbit multi-cycle survey with the 
refurbished ACS and WFC3 cameras on the Hubble Space Telescope (HST), 
providing unprecedented deep imaging of cluster cores in 14 passbands with 
full UV/optical/IR wavelength coverage. This largest space telescope cluster 
survey builds on the existing deep, wide-field Subaru images to yield the best 
evaluation of cluster lensing profiles over the full radial range, from 10 kpc 
to beyond 2000 kpc. By combining the highest quality weak and strong lensing 
data for an unbiased and representative cluster sample, we will (1) derive the 
representative equilibrium mass profile shapes and (2) robustly measure the 
cluster dark matter (DM) mass concentrations and their dispersion as a 
function of cluster mass and their evolution with redshift. These unique 
Subaru/ACS/WFC3 data will provide precise (~ 10%) observational challenges to 
scenarios for the DM mass distribution.