2019/07/22 by N. Huang, L. E. Bleem, B. Stalder +74 · 1 voice
Physics and Astronomy · #astro-ph.CO
paper · pdf · doi:10.3847/1538-3881/ab6a96
21 pages, 7 figures, associated data available at http://pole.uchicago.edu/public/data/sptsz-clusters. V2 was accepted to the AJ, and includes minor changes requested by the reviewer
arxiv published 2019/07/22 · arxiv created 2020/01/14 · arxiv updated 2020/02/26
We present a catalog of galaxy cluster candidates detected in 100 square degrees surveyed with the SPTpol receiver on the South Pole Telescope. The catalog contains 89 candidates detected with a signal-to-noise ratio greater than 4.6. The candidates are selected using the Sunyaev-Zel'dovich effect at 95 and 150 GHz. Using both space- and ground-based optical and infrared telescopes, we have confirmed 81 candidates as galaxy clusters. We use these follow-up images and archival images to estimate photometric redshifts for 66 galaxy clusters and spectroscopic observations to obtain redshifts for 13 systems. An additional 2 galaxy clusters are confirmed using the overdensity of near-infrared galaxies only, and are presented without redshifts. We find that 15 candidates (18% of the total sample) are at redshift of z ≥ 1.0, with a maximum confirmed redshift of z_\rmmax = 1.38 ± 0.10. We expect this catalog to contain every galaxy cluster with M500c > 2.6 × 1014 M_\odot h-170 and z > 0.25 in the survey area. The mass threshold is approximately constant above z = 0.25, and the complete catalog has a median mass of approximately M500c = 2.7 × 1014 M_\odot h-170. Compared to previous SPT works, the increased depth of the millimeter-wave data (11.2 and 6.5 μK-arcmin at 95 and 150 GHz, respectively) makes it possible to find more galaxy clusters at high redshift and lower mass.