Bleem, LE;
Bocquet, S;
Stalder, B;
Gladders, MD;
Ade, PAR;
Allen, SW;
Anderson, AJ;
... Zhang, Y; + view all
(2020)
The SPTpol Extended Cluster Survey.
The Astrophysical Journal
, 247
(1)
, Article 25. 10.3847/1538-4365/ab6993.
Preview |
Text
Brooks_The SPTpol Extended Cluster Survey_VoR.pdf - Published Version Download (2MB) | Preview |
Abstract
We describe the observations and resultant galaxy cluster catalog from the 2770 deg^{2} 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 x M^{14} M_{star} h^{-1}_{70} 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.
| Type: | Article |
|---|---|
| Title: | The SPTpol Extended Cluster Survey |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.3847/1538-4365/ab6993 |
| Publisher version: | https://doi.org/10.3847/1538-4365/ab6993 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher's terms and conditions. |
| Keywords: | Galaxy clusters (584); Strong gravitational lensing (1643); Large-scale structure of the universe (902) |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10094326 |
Archive Staff Only
 |
View Item |
