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The Spitzer Adaptation of the Red-sequence Cluster Survey is a z'-passband imaging survey of the SWIRE Legacy Survey Fields. Observations of the six fields have been made at all seven Spitzer (3.6, 4.5, 5.8, 8.0, 24, 70, 160 micron) passbands. SpARCS consists of deep (z'= 24 AB) observations made from both hemispheres using MegaCam at CFHT (Northern Fields) and MOSAICII at CTIO (Southern Fields). The cluster detection (z'-imaging) phase is now complete and has yielded hundreds of z > 1 cluster candidates detected based upon z'-[3.6] color. With a total effective area of 41.9 square degrees, SpARCS is currently the largest completed z > 1 cluster survey.

SpARCS has entered its cluster follow-up and analysis phase which will last for several years. To date, we have spectroscopically confirmed about a dozen z > 1 clusters. Below are three examples of rich clusters which SpARCS has discovered.

These examples are taken from Demarco et al, 2010, Muzzin et al, 2009 and Wilson et al, 2009. More examples may be found in the Cluster Gallery.