The X-ray properties of optically-selected clusters at z > 0.6

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Groups Of Galaxies, Clusters Of Galaxies, Supercluster, Cl1103-12, Cl1227-11, Xmm-Newton Proposal 04062102

Scientific paper

The ESO Distant Cluster Survey (EDisCS) comprises an extremely well-studied sample of optically-selected cluster fields, including eight spectroscopically-confirmed clusters at z > 0.6 for which velocity dispersions and weak lensing maps have already been derived. We have studied three fields with XMM to date and here propose a completion of the sample. The proposed observations will allow us to: i) significantly expand the high-redshift L_X - sigma and T - sigma relations; ii)study the X-ray properties of the progenitors of typical present-day clusters; iii) examine the inherent biases in X-ray-selected high-redshift cluster surveys; and iv) test the validity of various mass estimation methods at high redshift.

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