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The South Pole Telescope (SPT) is conducting a Sunyaev-Zel'dovich (SZ) effectsurvey over large areas of the southern sky, searching for massive galaxyclusters to high redshift. In this preliminary study, we focus on a 40square-degree area targeted by the Blanco Cosmology Survey (BCS), which iscentered roughly at right ascension 5h30m, declination -53 degrees. Over twoseasons of observations, this entire region has been mapped by the SPT at 95GHz, 150 GHz, and 225 GHz. We report the four most significant SPT detectionsof SZ clusters in this field, three of which were previously unknown and,therefore, represent the first galaxy clusters discovered with an SZ survey.The SZ clusters are detected as decrements with greater than 5-sigmasignificance in the high-sensitivity 150 GHz SPT map. The SZ spectrum of thesesources is confirmed by detections of decrements at the corresponding locationsin the 95 GHz SPT map and non-detections at those locations in the 225 GHz SPTmap. Multiband optical images from the BCS survey demonstrate significantconcentrations of similarly colored galaxies at the positions of the SZdetections. Photometric redshift estimates from the BCS data indicate that twoof the clusters lie at moderate redshift (z ~ 0.4) and two at high redshift (z>~ 0.8). One of the SZ detections was previously identified as a galaxy clusterusing X-ray data from the ROSAT All-Sky Survey (RASS). Potential RASScounterparts (not previously identified as clusters) are also found for two ofthe new discoveries. These first four galaxy clusters are the most significantSZ detections from a subset of the ongoing SPT survey. As such, they serve as ademonstration that SZ surveys, and the SPT in particular, can be an effectivemeans for finding galaxy clusters.

Galaxy clusters discovered with a Sunyaev-Zel'dovich effect survey