Galaxy Clusters Selected via the Sunyaev-Zel’dovich Effect in the SPTpol 100-Square-Degree Survey. (arXiv:1907.09621v1 [astro-ph.CO])

Galaxy Clusters Selected via the Sunyaev-Zel’dovich Effect in the SPTpol 100-Square-Degree Survey. (arXiv:1907.09621v1 [astro-ph.CO])
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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 $z geq 1.0$, with a
maximum confirmed redshift of $z_{rm{max}} = 1.38 pm 0.10$. We expect this
catalog to contain every galaxy cluster with $M_{500c} > 2.6 times 10^{14}
M_odot h^{-1}_{70}$ 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 $ M_{500c} = 2.7 times 10^{14} M_odot h^{-1}_{70}$.
Compared to previous SPT works, the increased depth of the millimeter-wave data
(11.2 and 6.5 $mu$K-arcmin at 95 and 150 GHz, respectively) makes it possible
to find more galaxy clusters at high redshift and lower mass.

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