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South Pole Telescope Detections of the Previously Unconfirmed Planck Early Sunyaev–Zel'dovich Clusters in the Southern Hemisphere

Story, K. and Padin, S. and Vieira, J. D. (2011) South Pole Telescope Detections of the Previously Unconfirmed Planck Early Sunyaev–Zel'dovich Clusters in the Southern Hemisphere. Astrophysical Journal Letters, 735 (2). Art. No. L36. ISSN 2041-8205.

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We present South Pole Telescope (SPT) observations of the five galaxy cluster candidates in the southern hemisphere which were reported as unconfirmed in the Planck Early Sunyaev-Zel'dovich (ESZ) sample. One cluster candidate, PLCKESZ G255.62-46.16, is located in the 2500 deg^2 SPT SZ survey region and was reported previously as SPT-CL J0411-4819. For the remaining four candidates, which are located outside of the SPT SZ survey region, we performed short, dedicated SPT observations. Each of these four candidates was strongly detected in maps made from these observations, with signal-to-noise ratios ranging from 6.3 to 13.8. We have observed these four candidates on the Magellan-Baade telescope and used these data to estimate cluster redshifts from the red sequence. Resulting redshifts range from 0.24 to 0.46. We report measurements of Y _(0'.75), the integrated Comptonization within a 0'.75 radius, for all five candidates. We also report X-ray luminosities calculated from ROSAT All-Sky Survey catalog counts, as well as optical and improved SZ coordinates for each candidate. The combination of SPT SZ measurements, optical red-sequence measurements, and X-ray luminosity estimates demonstrates that these five Planck ESZ cluster candidates do indeed correspond to real galaxy clusters with redshifts and observable properties consistent with the rest of the ESZ sample.

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Additional Information:© 2011 The American Astronomical Society. Received 2011 February 9; accepted 2011 June 1; published 2011 June 21. The SPT is supported by NSF grant ANT-0638937. Partial support is also provided by NSF grant PHY-0114422, the Kavli Foundation, and the Gordon and Betty Moore Foundation. The McGill group acknowledges funding from the NSERC of Canada, the Quebec Fonds de recherche sur la nature et les technologies, and the CIAR. Galaxy cluster research is supported at Harvard by NSF grant AST-1009012 and at SAO by NSF grants AST-1009649 and MRI-0723073. Benson acknowledges support from a KICP Fellowship, M. Brodwin from the W. M. Keck Foundation, A. Clocchiatti from CONICYT grants Basal CATA PFB 06/09 and FONDAP No. 15010003, R. J. Foley from a Clay Fellowship, R. Keisler from NASA Hubble Fellowship grant HF-51275.01, and B. Stalder from the Brinson Foundation. Facilities: SPT, Magellan:Baade (IMACS)
Funding AgencyGrant Number
Kavli FoundationUNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Quebec Fonds de rechercher sur la Nature et les TechnoligiesUNSPECIFIED
Canadian Institute for Advanced Research (CIAR)UNSPECIFIED
W. M. Keck FoundationUNSPECIFIED
CONICYT grants BasalCATA PFB 06/09
Clay FellowshipUNSPECIFIED
NASA Hubble FellowshipHF-51275.01
Brinson FoundationUNSPECIFIED
Subject Keywords:cosmology: observations; galaxies: clusters: individual (PLCKESZ G255.62-46.16, PLCKESZ G225.92-19.99, PLCKESZ G264.41+19.48, PLCKESZ G283.16-29.93, PLCKESZ G304.84-41.42)
Issue or Number:2
Classification Code:PACS: 98.65.Cw; 98.80.Ft; 98.70.Qy; 98.80.Es
Record Number:CaltechAUTHORS:20110815-080643246
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Official Citation:South Pole Telescope Detections of the Previously Unconfirmed Planck Early Sunyaev–Zel'dovich Clusters in the Southern Hemisphere K. Story et al. 2011 ApJ 735 L36
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:24843
Deposited By: Ruth Sustaita
Deposited On:15 Aug 2011 15:30
Last Modified:03 Oct 2019 03:00

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