Weighing the giants: X-ray and weak lensing studies measurements of the most massive clusters

Mathematics – Logic

Scientific paper

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Galaxy Clusters - Cosmology

Scientific paper

Chandra is a key instrument to understand the physics and evolution of galaxy clusters. But the combination with other high-quality, multi-wavelength observations is arguably even more powerful. We are conducting a multi-wavelength follow-up survey of 30 of the most massive clusters known at z=0.3-0.6, selected from the MAssive Clusters Survey (MACS). Our follow-up data consists of Chandra X-ray imaging, deep multi-color imaging from SuprimeCam and HST imaging. The weak lensing mass measurements derived from the optical imaging will be a vital ingredient to determine the non-thermal pressure component in clusters, and thus to calibrate them as cosmological probes. At the same time, the multi-wavelength data allows us to study intriguing clusters in more detail, e.g. to study the physics of merging clusters. I will present our first results, and highlight some of the most intriguing clusters, such as the cousin of the Bullet Cluster, MACSJ0025.4-1222.

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