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Paper: Subaru Weak Lensing Study of Merging Clusters of Galaxies
Volume: 399, Panoramic Views of Galaxy Formation and Evolution
Page: 111
Authors: Umetsu, K.; Okabe, N.
Abstract: We present 2D maps of mass, galaxies, and the intracluster medium (ICM) for a sample of merging clusters of galaxies based on a joint weak-lensing, optical photometric, and X-ray analysis. Our target clusters, representing various merging stages and conditions, allow us to investigate in details the physical interplay between dark matter, ICM, and galaxies associated with cluster formation and evolution. In the binary clusters, the projected mass, optical light, and X-ray distributions are overall similar and regular without significant substructures. On-going and cold-front merging clusters, on the other hand, reveal highly irregular mass distributions. Overall the mass distribution appears to be similar to the galaxy luminosity distribution, whereas their distributions are quite different from the ICM distribution in a various ways. A comparison of the ICM and virial temperatures of merging clusters from Xray and weak-lensing analyses, respectively, shows that the ICM temperature of on-going and cold-front clusters is systematically higher than the cluster virial temperature by a factor of ∼ 2. This temperature excess in the ICM could be explained by the effects of merger boosts.
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