(Proposal ID) S12B-048

(PI) Okabe, Nobuhiro

(Proposal Title)
Testing Hydrostatic Equilibrium of the Intracluster Medium from the Core to the Virial Radius Ic

(Abstract)
We repropose to conduct a diagnostic of the intracluster medium (ICM) states 
and a stringent test for hydrostatic equilibrium from the core to the virial 
radius on the basis of accurate weak lensing (WL) mass measurements, 
incorporating with the Suzaku X-ray satellite. Although our proposals were 
approved in previous semesters, we could not obtain any data due to winter 
storm or cooling system incident. It is therefore URGENT and important to 
measure cluster masses through this proposal. We perform a systematic WL study 
of a sample of three very nearby galaxy clusters with deep Suprime-Cam imaging 
for making an accurate determination of the cluster mass profile. Our project 
unveils the physical interplay between the ICM and the dark matter from the 
central region to the virial radius. We aims to (1) measure accurately mass 
profile from the WL measurement, (2) compare the lensing mass with the 
hydrostatic estimate from X-ray observations, (3) constrain the additional 
pressure to the thermal pressure by comparing the total pressure to balance 
fully the gravity of the lensing mass, and (4) investigate correlations 
between the thermalization process and cosmological large-scale structure 
environments, and mass dependence.