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

© 2020. The American Astronomical Society. All rights reserved. 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
Current View