Mathematics – Logic
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007noao.prop..480l&link_type=abstract
NOAO Proposal ID #2007B-0480
Mathematics
Logic
Scientific paper
High-redshift galaxy clusters provide strong constraints on cosmological models and galaxy formation scenarios. Several overdensities of galaxies have been found by various techniques as far as redshift z>5, but true galaxy clusters are practically unknown much beyond z 1. One of the best candidates for a true cluster or proto-cluster is centered on the Coup Fourre Galaxy (CFG) at z=2.3: 19 luminous galaxies all within a few projected Mpc. We have HST, Spitzer, and Palomar imaging of the field, including strong emission line and IR detections that imply star formation rates 10< SFR < 100 sfr and significant stellar masses. We propose optical spectroscopy with GMOS of the CFG and its 18 Lyα- and Hα-emitting companion galaxies in the same 3-arcminute (1.5 Mpc) field. If the redshifts are all or mostly confirmed to be z=2.3, then the targets will constitute at least a rich group or dense filament of galaxies and possibly a bound cluster. The spectra will open the window on this key laboratory of cluster galaxy evolution. Most importantly, the distribution of relative velocities will provide a direct dynamical estimate of the group or cluster's total mass - the most important parameter for understanding early structure formation. We will also use the spectra to place the CFGC in the context of the cluster mass- metallicity and size-luminosity relations, and to extend those relations to significantly higher redshift than currently feasible. This program was granted time in 06B but no data obtained.
Higdon James J.
Higdon Sarah
Lowenthal James D.
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