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We present a catalog of galaxy cluster candidates detected in 100 squaredegrees surveyed with the SPTpol receiver on the South Pole Telescope. Thecatalog contains 89 candidates detected with a signal-to-noise ratio greaterthan 4.6. The candidates are selected using the Sunyaev-Zel'dovich effect at 95and 150 GHz. Using both space- and ground-based optical and infraredtelescopes, we have confirmed 81 candidates as galaxy clusters. We use thesefollow-up images and archival images to estimate photometric redshifts for 66galaxy clusters and spectroscopic observations to obtain redshifts for 13systems. An additional 2 galaxy clusters are confirmed using the overdensity ofnear-infrared galaxies only, and are presented without redshifts. We find that15 candidates (18% of the total sample) are at redshift of $z \geq 1.0$, with amaximum confirmed redshift of $z_{\rm{max}} = 1.38 \pm 0.10$. We expect thiscatalog to contain every galaxy cluster with $M_{500c} > 2.6 \times 10^{14}M_\odot h^{-1}_{70}$ and $z > 0.25$ in the survey area. The mass threshold isapproximately constant above $z = 0.25$, and the complete catalog has a medianmass of approximately $ M_{500c} = 2.7 \times 10^{14} M_\odot h^{-1}_{70}$.Compared to previous SPT works, the increased depth of the millimeter-wave data(11.2 and 6.5 $\mu$K-arcmin at 95 and 150 GHz, respectively) makes it possibleto find more galaxy clusters at high redshift and lower mass.

Galaxy Clusters Selected via the Sunyaev-Zel'dovich Effect in the SPTpol 100-Square-Degree Survey