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We present a catalog of 689 galaxy cluster candidates detected at significance >4 via their thermal Sunyaev-Zel'dovich (SZ) effect signature in 95 and 150 GHz data from the 500-square-degree SPTpol survey. We use optical and infrared data from the Dark Energy Camera and the Wide-field Infrared Survey Explorer (WISE) and Spitzer satellites, to confirm 544 of these candidates as clusters with 94\% purity. The sample has an approximately redshift-independent mass threshold at redshift z>0. 25 and spans 1. 5 10^14 1. We use external radio data from the Sydney University Molonglo Sky Survey (SUMSS) to estimate contamination to the SZ signal from synchrotron sources. The contamination reduces the recovered by a median value of 0. 032, or 0. 8\% of the =4 threshold value, and 7\% of candidates have a predicted contamination greater than = 1. With the exception of a small number of systems (<1\%), an analysis of clusters detected in single-frequency 95 and 150 GHz data shows no significant contamination of the SZ signal by emission from dusty or synchrotron sources. This cluster sample will be a key component in upcoming astrophysical and cosmological analyses of clusters. The SPTpol millimeter-wave maps and associated data products used to produce this sample are available at https: //pole. uchicago. edu/public/data/sptpol₅00dclusters/index. html, and the NASA LAMBDA website. An interactive sky server with the SPTpol maps and Dark Energy Survey data release 2 images is also available at NCSA https: //skyviewer. ncsa. illinois. edu.
Bleem et al. (Fri,) studied this question.