Mathematics – Logic
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001noao.prop..306y&link_type=abstract
NOAO Proposal ID #2001B-0306
Mathematics
Logic
Scientific paper
We propose to use the CTIO 4m + MOSAICII to continue an efficient and unique, 2-color (z' and R) imaging survey of 50 deg^2, begun at CTIO in Jan. 2000. In conjunction with an now complete equivalent survey at the CFHT, we will create the largest sample of rich galaxy clusters up to z 1.4. The number density of clusters as a function of richness and z will provide a non-degenerate measurement of the cosmological parameters Ω_m and σ_8. The survey will also allow the study of cluster galaxy evolution with a well-defined sample up to z=1.4. We estimate that we will find 20-100 rich (Abell Class ≥1) z$> 0.5 clusters in the CTIO component of the survey, dependent on cosmology. We have already found numerous convincing rich cluster candidates at z>=1 in a preliminary analysis of the first 35 deg^2 of processed data. Extensive testing of the survey algorithm on 2-color data simulated to the survey depth shows that we can virtually eliminate projection effects, and can also estimate the redshift of the clusters with a precision of (Delta) z 7%. With estimated redshifts for the clusters, we will measure properties such as richness, luminosity function, blue fraction, and red sequence, of the clusters directly from these data (using statistical background correction methods), to achieve our scientific goals. The combined survey will be 6× larger than the NOAO DEEP survey - the only general survey currently underway which has similar sensitivity to high-z clusters - and will provide a large sample for various follow-up studies.
Barrientos Felipe L.
Ellingson Erica E.
Gladders Mike D.
Hall Patrick
Hoekstra Henk
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