We investigate, using simulated galaxy catalogs, the completeness of searches for massive clusters of galaxies in redshift surveys or imaging surveys with photometric redshift estimates, i.e., what fraction of clusters (M > 10~(14) h~(-1) solar mass) are found in such surveys. We demonstrate that the matched filter method provides an efficient and reliable means of identifying massive clusters even when the redshift estimates are crude. In true redshift surveys the method works extremely well. We demonstrate that it is possible to construct catalogs with high completeness and low contamination, where both vary little with redshift.
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