LoCuSS: An Unbiased Multi-wavelength Study of the Cluster Quadchotomy - Gas Cooling and Cluster Merging at z=0.2

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We propose a definitive study of cooling and merging in an unbiased sample of 34 clusters at z=0.2 to address "what are the physical differences between cool-core (CC) non-merging, CC merging, non-CC (NCC) non-merging and NCC merging clusters?". We will compile 4 sub-samples numbering ~5-10 clusters each, and measure the mean properties of each sub-sample. Archival Chandra data is available for 23/34 clusters, however they are biased to the more luminous clusters, and against NCC non-merger clusters. We therefore request ACIS-I observations of the remaining 11 at 20ks/cluster. These data will complete an outstanding multiwavelength dataset spanning SZE, far/mid-IR (Herschel & Spitzer), optical (HST and Subaru), UV (GALEX), X-ray (Chandra), that will become a valuable community resource.

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