Mathematics – Logic
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006noao.prop..304l&link_type=abstract
NOAO Proposal ID #2006B-0304
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.
Higdon James J.
Higdon Sarah
Lowenthal James D.
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