Spectroscopic Confirmation Of z > 1 Galaxy Clusters In The<br />Spitzer/IRAC Shallow Survey

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Using accurate photometric redshift probability functions for 200,000 galaxies, we have identified a sample of 24 robust z > 1 galaxy cluster candidates larger than 1014 solar masses in the 8.5 deg2 Spitzer/IRAC Shallow survey in the NDWFS Boötes field. The method is independent of the strength of the cluster red sequence, and therefore provides an unbiased window on the era of cluster formation. These are powerful systems with which to study the formation and evolution of large scale structure, as well as to constrain cosmological parameters. We will present the latest results from an ongoing follow-up spectroscopic campaign. All four clusters observed spectroscopically in 2005 were confirmed to reside at 1 < z < 1.5 (Brodwin et al. 2006, Elston et al. 2006, Eisenhardt et al. 2006), including the highest redshift cluster yet published (z = 1.41; Stanford et al. 2005). This unique sample will permit a determination of the mass assembly and star formation histories of massive early type galaxies.

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