LoCuSS: A Joint XMM-Newton Subaru Study of Galaxy Cluster Scaling Relations

We propose a systematic high precision investigation of the cluster massobservable scaling relations, employing XMM data and our Subaru weak lensingdata. The primary goal is to find out the best cluster mass proxy andinvestigate the behaviors of its scatter. Our preliminary results indicate thatgas mass has lower scatter with total mass, compared to the product of gas massand cluster temperature, Y_X. If those are confirmed, this will change thestrategy for carrying out the Xray cluster cosmology. Achieving a good controlover the systematics have major implications for cluster cosmologists strivingto measure the dark energy equation of state parameter, and should add a sharpmultiwavelength focus to investigations of the cluster physics. We require to observe 10 of 27 clusters (176ksec). truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]