A Deep Chandra Observation of the Distant Galaxy Cluster MS1137.5+6625

Details A Deep Chandra Observation of the Distant Galaxy Cluster MS1137.5+6625 A Deep Chandra Observation of the Distant Galaxy Cluster MS1137.5+6625

2004-02-06

arxiv.org/abs/astro-ph/0402139v1

Astrophys.J. 608 (2004) 731-741

Astronomy and Astrophysics

Astrophysics

16 pages, 6 figures, submitted to ApJ

Scientific paper

10.1086/420687

We present results from a deep Chandra observation of MS1137.5+66, a distant (z=0.783) and massive cluster of galaxies. Only a few similarly massive clusters are currently known at such high redshifts; accordingly, this observation provides much-needed information on the dynamical state of these rare systems. The cluster appears both regular and symmetric in the X-ray image. However, our analysis of the spectral and spatial X-ray data in conjunction with interferometric Sunyaev-Zel'dovich effect data and published deep optical imaging suggests the cluster has a fairly complex structure. The angular diameter distance we calculate from the Chandra and Sunyaev-Zel'dovich effect data assuming an isothermal, spherically symmetric cluster implies a low value for the Hubble constant for which we explore possible explanations.

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