Skip to main content
eScholarship
Open Access Publications from the University of California

The SPTPoL extended cluster survey

  • Author(s): Bleem, LE;
  • Bocquet, S;
  • Stalder, B;
  • Gladders, MD;
  • Ade, PAR;
  • Allen, SW;
  • Anderson, AJ;
  • Annis, J;
  • Ashby, MLN;
  • Austermann, JE;
  • Avila, S;
  • Avva, JS;
  • Bayliss, M;
  • Beall, JA;
  • Bechtol, K;
  • Bender, AN;
  • Benson, BA;
  • Bertin, E;
  • Bianchini, F;
  • Blake, C;
  • Brodwin, M;
  • Brooks, D;
  • Buckley-Geer, E;
  • Burke, DL;
  • Carlstrom, JE;
  • Carnero Rosell, A;
  • Carrasco Kind, M;
  • Carretero, J;
  • Chang, CL;
  • Chiang, HC;
  • Citron, R;
  • Corbett Moran, C;
  • Costanzi, M;
  • Crawford, TM;
  • Crites, AT;
  • da Costa, LN;
  • de Haan, T;
  • de Vicente, J;
  • Desai, S;
  • Diehl, HT;
  • Dietrich, JP;
  • Dobbs, MA;
  • Eifler, TF;
  • Everett, W;
  • Flaugher, B;
  • Floyd, B;
  • Frieman, J;
  • Gallicchio, J;
  • García-Bellido, J;
  • George, EM;
  • Gerdes, DW;
  • Gilbert, A;
  • Gruen, D;
  • Gruendl, RA;
  • Gschwend, J;
  • Gupta, N;
  • Gutierrez, G;
  • Halverson, NW;
  • Harrington, N;
  • Henning, JW;
  • Heymans, C;
  • Holder, GP;
  • Hollowood, DL;
  • Holzapfel, WL;
  • Honscheid, K;
  • Hrubes, JD;
  • Huang, N;
  • Hubmayr, J;
  • Irwin, KD;
  • James, DJ;
  • Jeltema, T;
  • Joudaki, S;
  • Khullar, G;
  • Klein, M;
  • Knox, L;
  • Kuropatkin, N;
  • Lee, AT;
  • Li, D;
  • Lidman, C;
  • Lowitz, A;
  • MacCrann, N;
  • Mahler, G;
  • Maia, MAG;
  • Marshall, JL;
  • McDonald, M;
  • McMahon, JJ;
  • Melchior, P;
  • Menanteau, F;
  • Meyer, SS;
  • Miquel, R;
  • Mocanu, LM;
  • Mohr, JJ;
  • Montgomery, J;
  • Nadolski, A;
  • Natoli, T;
  • Nibarger, JP;
  • Noble, G;
  • Novosad, V;
  • Padin, S;
  • Palmese, A
  • et al.
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 M500c ~ 4.4 ´ 1014 M☉ h70 -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 (l - 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.

Main Content
For improved accessibility of PDF content, download the file to your device.
Current View