Physics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007noao.prop..283w&link_type=abstract
NOAO Proposal ID #2007B-0283
Physics
Scientific paper
Proto-cluster regions, the highly overdense locations where the first massive early-type galaxies are almost certainly being born, have been discovered at z > 2.2 by a variety of observational techniques. Numerical simulations predict that these systems will evolve in a phase of rapid dynamical collapse into the quiescent, virialized clusters seen at z < 1.4. For the most massive systems, this collapse will occur in the very redshift regime where no cluster candidates have yet been identified. We have discovered a rare rich cluster candidate with a photometric redshift of 1.7 which bridges the "cluster desert" between the lowest-redshift confirmed proto-cluster (z = 2.16) and the highest-redshift confirmed X-ray cluster (z = 1.45). The bimodal color distribution and radial segregation of galaxies in the cluster field suggest that this object may be a first example of a massive cluster transitioning from a violent star-forming phase to a quiescent one. A GMOS spectroscopic confirmation of the redshift will pave the way for numerous follow-up studies of this unique object.
Gardner Jonathan P.
Gilbank David
Gladders Mike
Hoekstra Henk
Lacy Mark
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