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    Galaxy Clusters Selected via the Sunyaev-Zel'dovich Effect in the SPTpol 100-square-degree Survey

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    Author
    Huang, N; Bleem, LE; Stalder, B; Ade, PAR; Allen, SW; Anderson, AJ; Austermann, JE; Avva, JS; Beall, JA; Bender, AN; ...
    Date
    2020-02-17
    Source Title
    The Astronomical Journal
    Publisher
    American Astronomical Society
    University of Melbourne Author/s
    Reichardt, Christian; Bianchini, Federico; Gupta, Nikhel
    Affiliation
    School of Physics
    Metadata
    Show full item record
    Document Type
    Journal Article
    Citations
    Huang, N., Bleem, L. E., Stalder, B., Ade, P. A. R., Allen, S. W., Anderson, A. J., Austermann, J. E., Avva, J. S., Beall, J. A., Bender, A. N., Benson, B. A., Bianchini, F., Bocquet, S., Brodwin, M., Carlstrom, J. E., Chang, C. L., Chiang, H. C., Citron, R., Moran, C. C. ,... Yefremenko, V. (2020). Galaxy Clusters Selected via the Sunyaev-Zel'dovich Effect in the SPTpol 100-square-degree Survey. The Astronomical Journal, 159 (3), https://doi.org/10.3847/1538-3881/ab6a96.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/251353
    DOI
    10.3847/1538-3881/ab6a96
    Open Access URL
    https://arxiv.org/pdf/1907.09621
    ARC Grant code
    ARC/DP150103208
    Abstract
    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 two 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 z ≥ 1.0, with a maximum confirmed redshift of ${z}_{\max }=1.38\pm 0.10$. We expect this catalog to contain every galaxy cluster with ${M}_{500c}\gt 2.6\times {10}^{14}{M}_{\odot }{{h}}_{70}^{-1}$ 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 ${M}_{500c}=2.7\times {10}^{14}{M}_{\odot }{{h}}_{70}^{-1}$. 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.

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