Galaxy Clusters Discovered via the Thermal Sunyaev-Zel'dovich Effect in the 500-square-degree SPTpol Survey
The Open Journal of Astrophysics(2023)
摘要
We present a catalog of 689 galaxy cluster candidates detected at
significance ξ>4 via their thermal Sunyaev-Zel'dovich (SZ) effect signature
in 95 and 150 GHz data from the 500-square-degree SPTpol survey. We use optical
and infrared data from the Dark Energy Camera and the Wide-field Infrared
Survey Explorer (WISE) and satellites, to confirm 544 of these
candidates as clusters with ∼94% purity. The sample has an approximately
redshift-independent mass threshold at redshift z>0.25 and spans 1.5 ×
10^14 < M_500c < 9.1 × 10^14 M_⊙/h_70 and
0.031. We use external radio data from the Sydney University
Molonglo Sky Survey (SUMSS) to estimate contamination to the SZ signal from
synchrotron sources. The contamination reduces the recovered ξ by a median
value of 0.032, or ∼0.8% of the ξ=4 threshold value, and ∼7% of
candidates have a predicted contamination greater than Δξ = 1. With
the exception of a small number of systems (<1%), an analysis of clusters
detected in single-frequency 95 and 150 GHz data shows no significant
contamination of the SZ signal by emission from dusty or synchrotron sources.
This cluster sample will be a key component in upcoming astrophysical and
cosmological analyses of clusters. The SPTpol millimeter-wave maps and
associated data products used to produce this sample are available at
https://pole.uchicago.edu/public/data/sptpol_500d_clusters/index.html, and the
NASA LAMBDA website. An interactive sky server with the SPTpol maps and Dark
Energy Survey data release 2 images is also available at NCSA
https://skyviewer.ncsa.illinois.edu.
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