The Highest Redshift Galaxy Cluster

Details The Highest Redshift Galaxy Cluster The Highest Redshift Galaxy Cluster

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50333f&link_type=abstract

Spitzer Proposal ID #50333

Physics

Scientific paper

We propose to obtain IRAC four band and MIPS 24 micron imaging of XCS 2215-1738, the highest redshift galaxy cluster currently known, with z = 1.46. Optical spectroscopy at Keck and the VLT has identified 21 galaxies as having concurrent redshifts at z=1.46 and a velocity dispersion of 680 km/s. The approximate X-ray temperature, based on XMM archival data, is kT = 6.5 +/- 2.1 keV, also indicating that 2215-1738 is a massive cluster. The proposed IRAC data will reach to a depth of 2 magnitudes below L*. The MIPS data will detect starburst galaxies with IR luminosities above 3E11 Lsun. We will use the new data, in conjunction with existing optical and near-IR photometry, to estimate the stellar masses of the cluster galaxies, and to test for the presence of any dusty, star-forming cluster members.

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