The Assembly of a Giant Galaxy Cluster at Z=0.545

Mathematics

Scientific paper

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Chandra Proposal Id #04800694

Scientific paper

We propose a deep ACIS-I observation of MACSJ0717.5+3745, the most X-ray luminous cluster known at z>0.5. Its hugely disturbed X-ray morphology still reflecting the aftermath of a previous major merger event, the system is bound to grow yet more massive when it accretes a companion cluster currently 1.3/h Mpc away in the plane of the sky. From extensive follow-up observations (short ACIS observation, deep optical imaging, redshift survey, weak-lensing study, SZ observation) we find strong evidence for a profound displacement of the system's dark matter, gas and galaxy distributions. To complete an investigation offering unprecedented insight into the assembly of a giant cluster through a series of merger events we wish to measure the gas and temperature distribution in the cluster core.

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