Kim-Vy H. Tran et al. 1999 ApJ 522 39 doi:10.1086/307624
The Velocity Dispersion of MS 1054–03: A Massive Galaxy Cluster at High Redshift*
FREEKim-Vy H. Tran1, Daniel D. Kelson2, Pieter van Dokkum3,4, Marijn Franx3,4, Garth D. Illingworth5 and Daniel Magee5
Show affiliationsWe 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, σ = 1170 ± 150 km s-1, and the central mass is approximately 1.9 ± 0.5 × 1015 h-1 M
(within R = 1 h-1 Mpc; H0 = 100 h km s-1 Mpc-1, q0 = 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 (ΩM ~ 0.3) or flat, Λ-dominated (ΩM + ΩΛ = 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 σ-TX relation; we find no evidence for evolution in this relation to z ~ 0.8.
- Footnote
- Subject headings
cosmology: observations; galaxies: clusters: individual (MS 1054–0321); large-scale structure of universe
- Dates
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Issue 1 (1999 September 1)
Received 1998 November 3, accepted for publication 1999 March 11
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The Velocity Dispersion of MS 1054–03: A Massive Galaxy Cluster at High Redshift
Kim-Vy H. Tran et al. 1999 ApJ 522 39
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