SPTSZ MCMF: An extension of the SPTSZ catalog over the DES region
Abstract
We present an extension to a SunyaevZel'dovich Effect (SZE) selected cluster catalog based on observations from the South Pole Telescope (SPT); this catalog extends to lower signaltonoise than the previous SPTSZ catalog and therefore includes lower mass clusters. Optically derived redshifts, centres, richnesses and morphological parameters together with catalog contamination and completeness statistics are extracted using the multicomponent matched filter algorithm (MCMF) applied to the S/N>4 SPTSZ candidate list and the Dark Energy Survey (DES) photometric galaxy catalog. The main catalog contains 811 sources above S/N=4, has 91% purity and is 95% complete with respect to the original SZE selection. It contains in total 50% more clusters and twice as many clusters above z = 0.8 in comparison to the original SPTSZ sample. The MCMF algorithm allows us to define subsamples of the desired purity with traceable impact on catalog completeness. As an example, we provide two subsamples with S/N>4.25 and S/N>4.5 for which the sample contamination and cleaninginduced incompleteness are both as low as the expected Poisson noise for samples of their size. The subsample with S/N>4.5 has 98% purity and 96% completeness and is part of our new combined SPT cluster and DES weaklensing cosmological analysis. We measure the number of false detections in the SPTSZ candidate list as function of S/N, finding that it follows that expected from assuming Gaussian noise, but with a lower amplitude compared to previous estimates from simulations.
 Publication:

Monthly Notices of the Royal Astronomical Society
 Pub Date:
 June 2024
 DOI:
 10.1093/mnras/stae1359
 arXiv:
 arXiv:2309.09908
 Bibcode:
 2024MNRAS.tmp.1460K
 Keywords:

 galaxies: clusters: general;
 galaxies: clusters: intra cluster medium;
 galaxies: distances and redshifts;
 Astrophysics  Cosmology and Nongalactic Astrophysics;
 Astrophysics  High Energy Astrophysical Phenomena;
 Astrophysics  Instrumentation and Methods for Astrophysics
 EPrint:
 16 pages, 17 figures, submitted to MNRAS