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Bleem, L. E.; Bocquet, S.; Stalder, B.; Gladders, M. D.; Ade, P. A. R.; Allen, S. W.; Anderson, A. J.; Annis, J.; Ashby, M. L. N.; Austermann, J. E.; Avila, S.; Avva, J. S.; Bayliss, M.; Beall, J. A.; Bechtol, K.; Bender, A. N.; Benson, B. A.; Bertin, E.; Bianchini, F.; Blake, C.; Brodwin, M.; Brooks, D.; Buckley-Geer, E.; Burke, D. L.; Carlstrom, J. E.; Rosell, A. Carnero; Carrasco Kind, M.; Carretero, J.; Chang, C. L.; Chiang, H. C.; Citron, R.; Moran, C. Corbett; Costanzi, M.; Crawford, T. M.; Crites, A. T.; da Costa, L. N.; de Haan, T.; De Vicente, J.; Desai, S.; Diehl, H. T.; Dietrich, J. P.; Dobbs, M. A.; Eifler, T. F.; Everett, W.; Flaugher, B.; Floyd, B.; Frieman, J.; Gallicchio, J.; Garcia-Bellido, J.; George, E. M.; Gerdes, D. W.; Gilbert, A.; Gruen, D.; Gruendl, R. A.; Gschwend, J.; Gupta, N.; Gutierrez, G.; Halverson, N. W.; Harrington, N.; Henning, J. W.; Heymans, C.; Holder, G. P.; Hollowood, D. L.; Holzapfel, W. L.; Honscheid, K.; Hrubes, J. D.; Huang, N.; Hubmayr, J.; Irwin, K. D.; James, D. J.; Jeltema, T.; Joudaki, S.; Khullar, G.; Klein, M.; Knox, L.; Kuropatkin, N.; Lee, A. T.; Li, D.; Lidman, C.; Lowitz, A.; MacCrann, N.; Mahler, G.; Maia, M. A. G.; Marshall, J. L.; McDonald, M.; McMahon, J. J.; Melchior, P.; Menanteau, F.; Meyer, S. S.; Miquel, R.; Mocanu, L. M.; Mohr, J. J.; Montgomery, J.; Nadolski, A.; Natoli, T.; Nibarger, J. P.; Noble, G.; Novosad, V.; Padin, S.; Palmese, A.; Parkinson, D.; Patil, S.; Paz-Chinchon, F.; Plazas, A. A.; Pryke, C.; Ramachandra, N. S.; Reichardt, C. L.; Remolina Gonzalez, J. D.; Romer, A. K.; Roodman, A.; Ruhl, J. E.; Rykoff, E. S.; Saliwanchik, B. R.; Sanchez, E.; Saro, A.; Sayre, J. T.; Schaffer, K. K.; Schrabback, T.; Serrano, S.; Sharon, K.; Sievers, C.; Smecher, G.; Smith, M.; Soares-Santos, M.; Stark, A. A.; Story, K. T.; Suchyta, E.; Tarle, G.; Tucker, C.; Vanderlinde, K.; Veach, T.; Vieira, J. D.; Wang, G.; Weller, J.; Whitehorn, N.; Wu, W. L. K.; Yefremenko, V. and Zhang, Y. (2020): The SPTpol Extended Cluster Survey. In: Astrophysical Journal Supplement Series, Vol. 247, No. 1, 25

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We describe the observations and resultant galaxy cluster catalog from the 2770 deg(2) SPTpol Extended Cluster Survey (SPT-ECS). Clusters are identified via the Sunyaev-Zel'dovich (SZ) effect and confirmed with a combination of archival and targeted follow-up data, making particular use of data from the Dark Energy Survey (DES). With incomplete follow-up we have confirmed as clusters 244 of 266 candidates at a detection significance xi >= 5 and an additional 204 systems at 4 xi z = 0.49, and we have identified 44 strong gravitational lenses in the sample thus far. Radio data are used to characterize contamination to the SZ signal;the median contamination for confirmed clusters is predicted to be similar to 1% of the SZ signal at the xi > 4 threshold, and 10% of their measured SZ flux. We associate SZ-selected clusters, from both SPT-ECS and the SPT-SZ survey, with clusters from the DES redMaPPer sample, and we find an offset distribution between the SZ center and central galaxy in general agreement with previous work, though with a larger fraction of clusters with significant offsets. Adopting a fixed Planck-like cosmology, we measure the optical richness-SZ mass ( <CDATA <i ) relation and find it to be 28% shallower than that from a weak-lensing analysis of the DES data-a difference significant at the 4 sigma level-with the relations intersecting at lambda = 60. The SPT-ECS cluster sample will be particularly useful for studying the evolution of massive clusters and, in combination with DES lensing observations and the SPT-SZ cluster sample, will be an important component of future cosmological analyses.

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