AAS 204th Meeting, June 2004
Session 9 Clusters of Galaxies
Poster, Monday, May 31, 2004, 9:20am-6:30pm, Ballroom

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[9.04] The Cl 1604 Supercluster at z=0.9

R. R. Gal, L. M. Lubin (U.C. Davis)

We present spectroscopic confirmation and wide field imaging of the Cl 1604 supercluster at z ~0.9. Originally detected as two individual clusters, Cl 1604+4304 at z = 0.90 and Cl 1604+4321 at z = 0.92, closely separated in both redshift and sky position, subsequent imaging revealed a complex of red galaxies bridging the two clusters, suggesting that the region contained a large scale structure. We have carried out extensive multi-object spectroscopy, which, combined with previous measurements, provides over 600 redshifts in this area, including ~40 confirmed supercluster members. We detect two additional clusters that are part of this structure, Cl 1604+4314 at z = 0.87 and Cl 1604+4316 at z = 0.93. All four have properties typical of local clusters, with line-of-sight velocity dispersions between ~00 and ~000 km/s. Imaging of an extended area around the supercluster is used to estimate its maximal extent.

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