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The SPTPoL extended cluster survey

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Version 2 2023-06-07, 08:49
Version 1 2023-06-07, 07:14
journal contribution
posted on 2023-06-07, 08:49 authored by L E Bleem, S Bocquet, B Stalder, M D Gladders, P A R Ade, S W Allen, A J Anderson, J Annis, M L N Ashby, J E Austermann, S Avila, J S Avva, M Bayliss, J A Beall, Kathy RomerKathy Romer, others
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 ? = 5 and an additional 204 systems at 4 < ? < 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 ? > 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 4s level-with the relations intersecting at ? = 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.

History

Publication status

  • Published

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  • Published version

Journal

Astrophysical Journal Supplement Series

ISSN

0067-0049

Publisher

IOP Publishing

Issue

1

Volume

247

Article number

a25

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2020-06-11

First Open Access (FOA) Date

2020-06-11

First Compliant Deposit (FCD) Date

2020-06-10

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