Observations of a Distant X-ray Luminous Cluster of Galaxies

Details Observations of a Distant X-ray Luminous Cluster of Galaxies Observations of a Distant X-ray Luminous Cluster of Galaxies

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30957u&link_type=abstract

Spitzer Proposal ID #30957

Physics

Scientific paper

A key to understanding cluster evolution is to study distant clusters of galaxies in X-rays. We propose to observe with Chandra, XMM-Newton, and Spitzer Cl J1257+4738 (CL1257). CL1257 is the most distant (z=0.866) cluster found in the SHARC survey and the second most X-ray luminous cluster above z=0.85. The data will help to determine the global physical properties of CL1257 and its global dynamical state. With recent Gemini data we found 4 out of 6 cluster member galaxies to have [OII] 3727 emission lines, implying recent starburst activity. A compilation of luminosity versus redshift of known clusters above z=0.85 suggests that clusters do not reach their peak X-ray luminosity until z=0.9.

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