A Detailed Study of a z>1 Galaxy Cluster

We propose Chandra ACIS (130ks) + XMM EPIC (100ks) observations of a cluster atz1.05, recently detected in the XMMLSS survey, to measure the properties ofthe Xray gas and dark matter as part of a detailed multiwavelength study. Thisis only the sixth Xray selected cluster known at z>1. It appears to have arelaxed Xray morphology outside the core, making it almost unique at high z.The observations wil give detailed, accurate measurements of the morphology,total mass and gas mass fraction for the first time. Uniquely we will trace thesurface brightness and tempearture structure from the core to the virial radius,to give an accurate total mass and thus a benchmark point in the cluster scalingrelations at z1, a vital component of cosmological studies using Xray clusters. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]