**AAS 197, January 2001**

*Session 57. Galaxy Clusters: Galaxy Evolution*

Oral, Tuesday, January 9, 2001, 10:30am-12:00noon, San Diego
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## [57.03] The Red-Sequence Cluster Survey

*M.D. Gladders (Dept. of Astronomy, U. of Toronto)*

The Red-Sequence Cluster Survey (RCS) is a new galaxy
cluster survey designed to provide a large sample of
optically selected 0.1\leqz\leq1.4 clusters. The planned
survey data are 100 square degrees of two color (R and
z') imaging, with a 5\sigma depth ~2 mag past
M^{*} at z=1. The primary scientific drivers of the survey
are a derivation of \Omega_{m} and \sigma_{8} (from
N(M,z) for clusters) and a study of cluster-galaxy
evolution with a complete sample. In this talk I will give a
brief outline of the RCS survey parameters and sketch the
methods by which we intend to pursue the main scientific
goals, including an explicit calculation of the expected
survey completeness limits. These calculations show that the
survey should be complete, for all reasonable cluster
models, for Abell Richness Class \geq 1 clusters
(\sigma_{v}\geq750) to at least z=1.1. The remainder of
the talk will focus on preliminary results from the first
set of completely reduced data (~30 deg^{2}, of the
~60 deg^{2} in hand). These preliminary results provide
new examples of rich z>1 clusters and a possible filament
at z~1. I will also unveil several new examples of
cluster strong lensing by clusters at z>0.5, including an
extraordinary rich cluster at z~0.8 with four luminous
arcs corresponding to several different background sources
at different redshifts. Some of the possible science to come
from the RCS will be illustrated by a derivation of the
\Omega_{m},\sigma_{8} pair using only 1/10th of the
survey data, and a calculation of the correlation function
of luminous early-type galaxies to z~1.

If you would like more information about this abstract, please
follow the link to http://astro.utoronto.ca/~gladders/RCS/.
This link was provided by the
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