Physics
Scientific paper
Jul 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hst..prop10531m&link_type=abstract
HST Proposal ID #10531
Physics
Hst Proposal Id #10531 Cosmology
Scientific paper
We have been engaged in a serendipitous search for very distant clusters based on extended X-ray sources in archival XMM-Newton observations, followed up by R and z snapshot imaging with VLT-FORS2. Very recent VLT-FORS2 spectroscopy of the best high-z candidate {reddest R-z galaxy overdensity} has unambiguously confirmed the presence of a massive cluster at z = 1.392 {11 secure redshifts}, a record-breaking distance to date, which bears a crucial leverage on the evolution and formation of the most massive galaxies and clusters. We propose here to obtain deep NICMOS images in the H band and ACS images in the z band of the z = 1.4 cluster. The high resolution and sensitivity will allow us to study morphologies, measure lengthscales and surface photometry of the cluster members. We will analyse the color-magnitude relation and, in combination with velocity dispersions from VLT-FORS2 spectroscopy, we will extend the study of the Fundamental Plane to the highest possible limit. Tracing these scaling relations in clusters to an unprecedented look-back time will enable us to put strong constraints on the formation epoch of cluster galaxies.
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