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The SPTpol Extended Cluster Survey

Bleem, L. E.
•
Bocquet, S.
•
Stalder, B.
altro
Zhang, Y.
2020
  • journal article

Periodico
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
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∼ 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 (λ-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.
DOI
10.3847/1538-4365/ab6993
WOS
WOS:000519104700001
Archivio
http://hdl.handle.net/11368/2962517
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85084130581
https://iopscience.iop.org/article/10.3847/1538-4365/ab6993
Diritti
open access
FVG url
https://arts.units.it/bitstream/11368/2962517/1/Bleem_2020_ApJS_247_25.pdf
Soggetti
  • Astrophysics - Cosmol...

Web of Science© citazioni
91
Data di acquisizione
Mar 24, 2024
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Data di acquisizione
Apr 19, 2024
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