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For refcode 1999ApJ...522...39T:
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Copyright by American Astronomical Society. Reproduced by permission
1999ApJ...522...39T The Velocity Dispersion of MS 1054-03: A Massive Galaxy Cluster at High Redshift KIM-VY H. TRAN, DANIEL D. KELSON, PIETER VAN DOKKUM, MARIJN FRANX, GARTH D. ILLINGWORTH, AND DANIEL MAGEE Received 1998 November 3; accepted 1999 March 11 ABSTRACT We present results from a dynamical study of the high-redshift, massive, X-ray-luminous galaxy cluster MS 1054-03. We significantly increase the number of confirmed cluster members by adding 20 to an existing set of 12; using the confirmed members, we estimate MS 1054-03's redshift, velocity dispersion, and mass. We find that z = 0.8329+/-0.0017, {sigma}=1170+/-150 km s^-1^, and the central mass is approximately 1.9+/-0.5x10^15^ h^-1^ M_sun_ (within R=1 h^-1^ Mpc; H_0_ = 100 h km s^-1^ Mpc^-1^, q_0_ = 0.5). MS 1054-03 is one of a handful of high-redshift (z>0.5) clusters known that also has X-ray and weak-lensing observations; we find our dynamical mass agrees with mass estimates from both studies. The confirmation of MS 1054- 03 as a massive cluster at z~0.8 is consistent with an open ({OMEGA}_M_ ~ 0.3) or flat, {LAMBDA}-dominated ({OMEGA}_M_+{OMEGA}_{LAMBDA}_ = 1) universe. In addition, we compare MS 1054-03's velocity dispersion and X- ray temperature to a sample of low- and intermediate-redshift galaxy clusters to test for evolution in the {sigma}-TX relation; we find no evidence for evolution in this relation to z~0.8. Subject headings: cosmology: observations-galaxies: clusters: individual (MS 1054-0321)-large-scale structure of universe
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