(Proposal ID) S10B-064

(PI) Futamase, Toshifumi

(Proposal Title)
Exploring Masses, Profiles and Shapes of Dark Matter Halos with Cluster 
Weak Lensing II

(Abstract)
To complete our scientific goals approved in 2010A, we continuously propose to 
carry out a systematic multi-wavelength survey of X-ray luminous clusters. 
Thanks to the unique capability of Suprime-Cam, we have so far obtained the 
highquality lensing data of 19 clusters, which allow for the accurate 
reconstruction of total mass distribution in each cluster field. We are 
thoroughly using the lensing measurement data to obtain several interesting 
results that are relevant for dark energy cosmology and cluster physics such 
as the nature of dark matter: (1) constructing the cluster mass and observable 
scaling relations by comparing the lensing masses with other wavelength 
observables, X-ray (XMM), the Sunyaev-Zel'dovich effect (SZA), and the 
dynamical mass estimates (MMT/Hectospec), (2) confirming that the Subaru 
lensing data is consistent with the Navarro-Frenk-White model predictions for 
the cluster mass distribution over scales ranging from 100kpc to a few Mpc, 
and (3) detection, for the first time, the dark matter halo ellipticity from 
the full two-dimensional analysis of background galaxy images. However, the 
results are not yet conclusive due to the limited sample size. Therefore we 
need more lensing clusters (ideally ~80 clusters) to obtain robust conclusions 
at 4-5 sigma level.