AAS 207th Meeting, 8-12 January 2006
Session 144 Dark Energy, Cosmology and TeV Sources
HEAD Oral, Wednesday, 10:00-11:30am, January 11, 2006, Ballroom/Salon 2

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[144.03] Cosmological Results from 400 Square Degrees Distant Cluster Survey with ROSAT and Chandra

A. Vikhlinin (SAO), 400d Survey Team

We have serendipitously detected a large number of high-redshift galaxy clusters in ROSAT pointings covering over 400 square degrees of extragalactic sky. Each X-ray detection is optically confirmed and spectroscopic redshifts were obtained for all objects. The most massive distant clusters (43 objects at z>0.35) were followed up with Chandra. This program is nearly completed. These observations provide the most accurate to-date measurement of the cluster number density evolution. We will present the cosmological constraints provided by the 400d distant cluster sample.

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