[Normal Galaxies, Clusters of Galaxies -- Oral ]

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

Anja von der Linden, KIPAC/Stanford
Doug Applegate (KIPAC), Pat Kelly (KIPAC), Mark Allen (KIPAC), Steve Allen (KIPAC), Harald Ebeling (U Hawaii), Adam Mantz (KIPAC)

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.