The SpARCS z > 1 Cluster Survey

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

New infrared and optical capabilities are facilitating large, homogeneous cluster surveys at z > 1. The Spitzer Adaptation of the Red-sequence Cluster Survey (SpARCS) is a deep z'-band imaging survey in the 50 square degree Spitzer SWIRE Legacy fields. Now complete, SpARCS is currently the largest z > 1 cluster survey, and has discovered hundreds of new cluster candidates using the Cluster Red-Sequence technique.
I will present a status report on our extensive follow-up observations of the richest candidates, including an ongoing multi-semester campaign, The Gemini Cluster Astrophysics Spectroscopic Survey (GCLASS), to measure 50 redshifts in each of ten SpARCS clusters. I will also discuss follow-up deep widefield Spitzer (IRAC and MIPS) and ground-based imaging, which is revealing these massive structures in formation.

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