Redshifts, Sample Purity, and BCG Positions for the Galaxy Cluster Catalog from the first 720 Square Degrees of the South Pole Telescope Survey
We present the results of the ground- and space-based optical and near-infrared (NIR) follow-up of 224 galaxy cluster candidates detected with the Sunyaev-Zel'dovich (SZ) effect in the 720 deg^2 of the South Pole Telescope (SPT) survey completed in the 2008 and 2009 observing seasons. We use th...
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ftdatacite:10.48550/arxiv.1207.4369 2023-05-15T18:22:14+02:00 Redshifts, Sample Purity, and BCG Positions for the Galaxy Cluster Catalog from the first 720 Square Degrees of the South Pole Telescope Survey Song, J. Zenteno, A. Stalder, B. Desai, S. Bleem, L. E. Aird, K. A. Armstrong, R. Ashby, M. L. N. Bayliss, M. Bazin, G. Benson, B. A. Bertin, E. Brodwin, M. Carlstrom, J. E. Chang, C. L. Cho, H. M. Clocchiatti, A. Crawford, T. M. Crites, A. T. de Haan, T. Dobbs, M. A. Dudley, J. P. Foley, R. J. George, E. M. Gettings, D. Gladders, M. D. Gonzalez, A. H. Halverson, N. W. Harrington, N. L. High, F. W. Holder, G. P. Holzapfel, W. L. Hoover, S. Hrubes, J. D. Joy, M. Keisler, R. Knox, L. Lee, A. T. Leitch, E. M. Liu, J. Lueker, M. Luong-Van, D. Marrone, D. P. McDonald, M. McMahon, J. J. Mehl, J. Meyer, S. S. Mocanu, L. Mohr, J. J. Montroy, T. E. Natoli, T. Nurgaliev, D. Padin, S. Plagge, T. Pryke, C. Reichardt, C. L. Rest, A. Ruel, J. Ruhl, J. E. Saliwanchik, B. R. Saro, A. Sayre, J. T. Schaffer, K. K. Shaw, L. Shirokoff, E. Suhada, R. Spieler, H. G. Stanford, S. A. Staniszewski, Z. Stark, A. A. Story, K. Stubbs, C. W. van Engelen, A. Vanderlinde, K. Vieira, J. D. Williamson, R. Zahn, O. 2012 https://dx.doi.org/10.48550/arxiv.1207.4369 https://arxiv.org/abs/1207.4369 unknown arXiv https://dx.doi.org/10.1088/0004-637x/761/1/22 arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ Cosmology and Nongalactic Astrophysics astro-ph.CO FOS Physical sciences article-journal Article ScholarlyArticle Text 2012 ftdatacite https://doi.org/10.48550/arxiv.1207.4369 https://doi.org/10.1088/0004-637x/761/1/22 2022-04-01T13:41:58Z We present the results of the ground- and space-based optical and near-infrared (NIR) follow-up of 224 galaxy cluster candidates detected with the Sunyaev-Zel'dovich (SZ) effect in the 720 deg^2 of the South Pole Telescope (SPT) survey completed in the 2008 and 2009 observing seasons. We use the optical/NIR data to establish whether each candidate is associated with an overdensity of galaxies and to estimate the cluster redshift. Most photometric redshifts are derived through a combination of three different cluster redshift estimators using red-sequence galaxies, resulting in an accuracy of Δz/(1+z)=0.017, determined through comparison with a subsample of 57 clusters for which we have spectroscopic redshifts. We successfully measure redshifts for 158 systems and present redshift lower limits for the remaining candidates. The redshift distribution of the confirmed clusters extends to z=1.35 with a median of z_{med}=0.57. Approximately 18% of the sample with measured redshifts lies at z>0.8. We estimate a lower limit to the purity of this SPT SZ-selected sample by assuming that all unconfirmed clusters are noise fluctuations in the SPT data. We show that the cumulative purity at detection significance ξ>5 (ξ>4.5) is >= 95 (>= 70%). We present the red brightest cluster galaxy (rBCG) positions for the sample and examine the offsets between the SPT candidate position and the rBCG. The radial distribution of offsets is similar to that seen in X-ray-selected cluster samples, providing no evidence that SZ-selected cluster samples include a different fraction of recent mergers than X-ray-selected cluster samples. : 22 pages, 7 figures, 1 multi-page table at the end of the article Text South pole DataCite Metadata Store (German National Library of Science and Technology) South Pole |
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Cosmology and Nongalactic Astrophysics astro-ph.CO FOS Physical sciences |
spellingShingle |
Cosmology and Nongalactic Astrophysics astro-ph.CO FOS Physical sciences Song, J. Zenteno, A. Stalder, B. Desai, S. Bleem, L. E. Aird, K. A. Armstrong, R. Ashby, M. L. N. Bayliss, M. Bazin, G. Benson, B. A. Bertin, E. Brodwin, M. Carlstrom, J. E. Chang, C. L. Cho, H. M. Clocchiatti, A. Crawford, T. M. Crites, A. T. de Haan, T. Dobbs, M. A. Dudley, J. P. Foley, R. J. George, E. M. Gettings, D. Gladders, M. D. Gonzalez, A. H. Halverson, N. W. Harrington, N. L. High, F. W. Holder, G. P. Holzapfel, W. L. Hoover, S. Hrubes, J. D. Joy, M. Keisler, R. Knox, L. Lee, A. T. Leitch, E. M. Liu, J. Lueker, M. Luong-Van, D. Marrone, D. P. McDonald, M. McMahon, J. J. Mehl, J. Meyer, S. S. Mocanu, L. Mohr, J. J. Montroy, T. E. Natoli, T. Nurgaliev, D. Padin, S. Plagge, T. Pryke, C. Reichardt, C. L. Rest, A. Ruel, J. Ruhl, J. E. Saliwanchik, B. R. Saro, A. Sayre, J. T. Schaffer, K. K. Shaw, L. Shirokoff, E. Suhada, R. Spieler, H. G. Stanford, S. A. Staniszewski, Z. Stark, A. A. Story, K. Stubbs, C. W. van Engelen, A. Vanderlinde, K. Vieira, J. D. Williamson, R. Zahn, O. Redshifts, Sample Purity, and BCG Positions for the Galaxy Cluster Catalog from the first 720 Square Degrees of the South Pole Telescope Survey |
topic_facet |
Cosmology and Nongalactic Astrophysics astro-ph.CO FOS Physical sciences |
description |
We present the results of the ground- and space-based optical and near-infrared (NIR) follow-up of 224 galaxy cluster candidates detected with the Sunyaev-Zel'dovich (SZ) effect in the 720 deg^2 of the South Pole Telescope (SPT) survey completed in the 2008 and 2009 observing seasons. We use the optical/NIR data to establish whether each candidate is associated with an overdensity of galaxies and to estimate the cluster redshift. Most photometric redshifts are derived through a combination of three different cluster redshift estimators using red-sequence galaxies, resulting in an accuracy of Δz/(1+z)=0.017, determined through comparison with a subsample of 57 clusters for which we have spectroscopic redshifts. We successfully measure redshifts for 158 systems and present redshift lower limits for the remaining candidates. The redshift distribution of the confirmed clusters extends to z=1.35 with a median of z_{med}=0.57. Approximately 18% of the sample with measured redshifts lies at z>0.8. We estimate a lower limit to the purity of this SPT SZ-selected sample by assuming that all unconfirmed clusters are noise fluctuations in the SPT data. We show that the cumulative purity at detection significance ξ>5 (ξ>4.5) is >= 95 (>= 70%). We present the red brightest cluster galaxy (rBCG) positions for the sample and examine the offsets between the SPT candidate position and the rBCG. The radial distribution of offsets is similar to that seen in X-ray-selected cluster samples, providing no evidence that SZ-selected cluster samples include a different fraction of recent mergers than X-ray-selected cluster samples. : 22 pages, 7 figures, 1 multi-page table at the end of the article |
format |
Text |
author |
Song, J. Zenteno, A. Stalder, B. Desai, S. Bleem, L. E. Aird, K. A. Armstrong, R. Ashby, M. L. N. Bayliss, M. Bazin, G. Benson, B. A. Bertin, E. Brodwin, M. Carlstrom, J. E. Chang, C. L. Cho, H. M. Clocchiatti, A. Crawford, T. M. Crites, A. T. de Haan, T. Dobbs, M. A. Dudley, J. P. Foley, R. J. George, E. M. Gettings, D. Gladders, M. D. Gonzalez, A. H. Halverson, N. W. Harrington, N. L. High, F. W. Holder, G. P. Holzapfel, W. L. Hoover, S. Hrubes, J. D. Joy, M. Keisler, R. Knox, L. Lee, A. T. Leitch, E. M. Liu, J. Lueker, M. Luong-Van, D. Marrone, D. P. McDonald, M. McMahon, J. J. Mehl, J. Meyer, S. S. Mocanu, L. Mohr, J. J. Montroy, T. E. Natoli, T. Nurgaliev, D. Padin, S. Plagge, T. Pryke, C. Reichardt, C. L. Rest, A. Ruel, J. Ruhl, J. E. Saliwanchik, B. R. Saro, A. Sayre, J. T. Schaffer, K. K. Shaw, L. Shirokoff, E. Suhada, R. Spieler, H. G. Stanford, S. A. Staniszewski, Z. Stark, A. A. Story, K. Stubbs, C. W. van Engelen, A. Vanderlinde, K. Vieira, J. D. Williamson, R. Zahn, O. |
author_facet |
Song, J. Zenteno, A. Stalder, B. Desai, S. Bleem, L. E. Aird, K. A. Armstrong, R. Ashby, M. L. N. Bayliss, M. Bazin, G. Benson, B. A. Bertin, E. Brodwin, M. Carlstrom, J. E. Chang, C. L. Cho, H. M. Clocchiatti, A. Crawford, T. M. Crites, A. T. de Haan, T. Dobbs, M. A. Dudley, J. P. Foley, R. J. George, E. M. Gettings, D. Gladders, M. D. Gonzalez, A. H. Halverson, N. W. Harrington, N. L. High, F. W. Holder, G. P. Holzapfel, W. L. Hoover, S. Hrubes, J. D. Joy, M. Keisler, R. Knox, L. Lee, A. T. Leitch, E. M. Liu, J. Lueker, M. Luong-Van, D. Marrone, D. P. McDonald, M. McMahon, J. J. Mehl, J. Meyer, S. S. Mocanu, L. Mohr, J. J. Montroy, T. E. Natoli, T. Nurgaliev, D. Padin, S. Plagge, T. Pryke, C. Reichardt, C. L. Rest, A. Ruel, J. Ruhl, J. E. Saliwanchik, B. R. Saro, A. Sayre, J. T. Schaffer, K. K. Shaw, L. Shirokoff, E. Suhada, R. Spieler, H. G. Stanford, S. A. Staniszewski, Z. Stark, A. A. Story, K. Stubbs, C. W. van Engelen, A. Vanderlinde, K. Vieira, J. D. Williamson, R. Zahn, O. |
author_sort |
Song, J. |
title |
Redshifts, Sample Purity, and BCG Positions for the Galaxy Cluster Catalog from the first 720 Square Degrees of the South Pole Telescope Survey |
title_short |
Redshifts, Sample Purity, and BCG Positions for the Galaxy Cluster Catalog from the first 720 Square Degrees of the South Pole Telescope Survey |
title_full |
Redshifts, Sample Purity, and BCG Positions for the Galaxy Cluster Catalog from the first 720 Square Degrees of the South Pole Telescope Survey |
title_fullStr |
Redshifts, Sample Purity, and BCG Positions for the Galaxy Cluster Catalog from the first 720 Square Degrees of the South Pole Telescope Survey |
title_full_unstemmed |
Redshifts, Sample Purity, and BCG Positions for the Galaxy Cluster Catalog from the first 720 Square Degrees of the South Pole Telescope Survey |
title_sort |
redshifts, sample purity, and bcg positions for the galaxy cluster catalog from the first 720 square degrees of the south pole telescope survey |
publisher |
arXiv |
publishDate |
2012 |
url |
https://dx.doi.org/10.48550/arxiv.1207.4369 https://arxiv.org/abs/1207.4369 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
https://dx.doi.org/10.1088/0004-637x/761/1/22 |
op_rights |
arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
op_doi |
https://doi.org/10.48550/arxiv.1207.4369 https://doi.org/10.1088/0004-637x/761/1/22 |
_version_ |
1766201606363152384 |