DOE OSTI · 1597079
The SPTpol Extended Cluster Survey
Abstract
We describe the observations and resultant galaxy cluster catalog from the 2770 deg2 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 ξ ≥ 5 and an additional 204 systems at 4 < ξ < 5. The confirmed sample has a median mass of ${M}_{500c}\sim 4.4\times {10}^{14}\,{M}_{\odot }\,{h}_{70}^{-1}$ and a median redshift of 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 ~1% of the SZ signal at the ξ > 4 threshold, and <4% of clusters have a predicted contamination >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 ($\lambda -M$) relation and find it to be 28% shallower than that from a weak-lensing analysis of the DES data—a difference significant at the 4σ level—with the relations intersecting at λ = 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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Bleem, L. E. (ORCID:0000000176655079), Bocquet, S. (ORCID:000000024900805X), Stalder, B. (ORCID:0000000309734900), Gladders, M. D., Ade, P. A. R. (ORCID:0000000251270401), Allen, S. W., Anderson, A. J., Annis, J. (ORCID:0000000206093987), Ashby, M. L. N. (ORCID:0000000239930745), Austermann, J. E., Avila, S., Avva, J. S., Bayliss, M., Beall, J. A., Bechtol, K., Bender, A. N., Benson, B. A. (ORCID:0000000251086823), Bertin, E., Bianchini, F. (ORCID:0000000348473483), Blake, C., Brodwin, M. (ORCID:000000024208798X), Brooks, D., Buckley-Geer, E. (ORCID:0000000233040733), Burke, D. L., Carlstrom, J. E., Rosell, A. Carnero (ORCID:0000000330445150), Carrasco Kind, M. (ORCID:0000000248023194), Carretero, J. (ORCID:0000000231300204), Chang, C. L., Chiang, H. C., Citron, R., Moran, C. Corbett, Costanzi, M., Crawford, T. M. (ORCID:0000000190005013), Crites, A. T., da Costa, L. N., de Haan, T., De Vicente, J. (ORCID:0000000183186813), Desai, S. (ORCID:0000000204663288), Diehl, H. T. (ORCID:0000000283577467), Dietrich, J. P. (ORCID:0000000281349591), Dobbs, M. A., Eifler, T. F. (ORCID:0000000218943301), Everett, W., Flaugher, B., Floyd, B., Frieman, J. (ORCID:0000000340793263), Gallicchio, J., García-Bellido, J. (ORCID:0000000293708360), George, E. M., Gerdes, D. W. (ORCID:0000000169422736), Gilbert, A., Gruen, D. (ORCID:0000000332707644), Gruendl, R. A. (ORCID:0000000245886517), Gschwend, J., Gupta, N., Gutierrez, G. (ORCID:0000000308250517), Halverson, N. W., Harrington, N., Henning, J. W., Heymans, C., Holder, G. P., Hollowood, D. L. (ORCID:0000000293694157), Holzapfel, W. L., Honscheid, K., Hrubes, J. D., Huang, N., Hubmayr, J., Irwin, K. D., James, D. J., Jeltema, T., Joudaki, S., Khullar, G. (ORCID:0000000234757648), Klein, M., Knox, L., Kuropatkin, N. (ORCID:0000000325110946), Lee, A. T., Li, D., Lidman, C. (ORCID:0000000317310497), Lowitz, A., MacCrann, N., Mahler, G. (ORCID:0000000332662001), Maia, M. A. G., Marshall, J. L. (ORCID:0000000307109474), McDonald, M., McMahon, J. J., Melchior, P. (ORCID:0000000288735065), Menanteau, F. (ORCID:0000000213722534), Meyer, S. S., Miquel, R. (ORCID:0000000266104836), Mocanu, L. M., Mohr, J. J., Montgomery, J., Nadolski, A., Natoli, T., Nibarger, J. P., Noble, G., Novosad, V., Padin, S., Palmese, A. (ORCID:0000000260110530). 2020-03-01. The SPTpol Extended Cluster Survey. https://doi.org/10.3847/1538-4365%2Fab6993
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