Galaxy Clusters at z > 1 in the IRAC Shallow Survey

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The IRAC Shallow Survey (Eisenhardt et al. 2004) is a wide-field (8.5 deg2) 3.6-8 um survey in Boötes designed to study the evolution of large-scale structure since z = 2. A primary goal of the survey is to carry out a search for high redshift 1 < z < 2 galaxy clusters. In addition to the powerful cosmological constraints provided by this sample, it will permit a study of the mass assembly history in rich environments, including an investigation of the "downsizing" phenomenon reported in several recent studies (e.g. Treu et al. 2005). Our cluster search methodology consists of a wavelet decomposition of structure in dz = 0.2 photometric redshift slices. This technique takes full advantage of the extensive ancillary data in the Boötes field, and, importantly, makes no assumptions about the colours of cluster members, which are increasingly uncertain at redshifts approaching z = 2. We have discovered ~20 high-significance cluster candidates at 1 < z < 2 and are pursuing follow-up observations.

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