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Multi-band photometric and multi-object spectroscopic surveys of merginggalaxy clusters allow for the characterization of the distributions ofconstituent dark matter and galaxy populations, constraints on the dynamics ofthe merging subclusters, and an understanding of galaxy evolution of membergalaxies. We present deep photometric observations from Subaru/SuprimeCam and acatalog of $\sim$5400 spectroscopic cluster members from Keck/DEIMOS across 29merging galaxy clusters ranging in redshift from $z=0.07$ to $0.55$. Theensemble is compiled based on the presence of radio relics, which highlightcluster scale collisionless shocks in the intra-cluster medium. Together withthe spectroscopic and photometric information, the velocities, timescales, andgeometries of the respective merging events may be tightly constrained. In thispreliminary analysis, the velocity distributions of 28 of the 29 clusters areshown to be well fit by single Gaussians. This indicates that radio relicmergers largely occur transverse to the line of sight and/or near apocenter. Inthis paper, we present our optical and spectroscopic surveys, preliminaryresults, and a discussion of the value of radio relic mergers for developingaccurate dynamical models of each system.

Merging Cluster Collaboration: Optical and Spectroscopic Survey of a Radio-Selected Sample of Twenty Nine Merging Galaxy Clusters