Redshifts, Sample Purity, and BCG Positions for the Galaxy Cluster Catalog from the First 720 Square Degrees of the South Pole Telescope Survey
International audience 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 obser...
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Format: | Article in Journal/Newspaper |
Language: | English |
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Online Access: | https://hal.science/hal-03645708 https://doi.org/10.1088/0004-637X/761/1/22 |
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ftccsdartic:oai:HAL:hal-03645708v1 2023-11-05T03:45:05+01:00 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. Šuhada, 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. Institut d'Astrophysique de Paris (IAP) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) 2012 https://hal.science/hal-03645708 https://doi.org/10.1088/0004-637X/761/1/22 en eng HAL CCSD American Astronomical Society info:eu-repo/semantics/altIdentifier/arxiv/1207.4369 info:eu-repo/semantics/altIdentifier/doi/10.1088/0004-637X/761/1/22 hal-03645708 https://hal.science/hal-03645708 ARXIV: 1207.4369 BIBCODE: 2012ApJ.761.22S doi:10.1088/0004-637X/761/1/22 ISSN: 0004-637X EISSN: 1538-4357 The Astrophysical Journal https://hal.science/hal-03645708 The Astrophysical Journal, 2012, 761, ⟨10.1088/0004-637X/761/1/22⟩ cosmology: observations galaxies: clusters: general galaxies: distances and redshifts Astrophysics - Cosmology and Extragalactic Astrophysics [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2012 ftccsdartic https://doi.org/10.1088/0004-637X/761/1/22 2023-10-07T23:05:35Z International audience 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 from X-ray-selected cluster samples. Article in Journal/Newspaper South pole Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) The Astrophysical Journal 761 1 22 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
cosmology: observations galaxies: clusters: general galaxies: distances and redshifts Astrophysics - Cosmology and Extragalactic Astrophysics [SDU]Sciences of the Universe [physics] |
spellingShingle |
cosmology: observations galaxies: clusters: general galaxies: distances and redshifts Astrophysics - Cosmology and Extragalactic Astrophysics [SDU]Sciences of the Universe [physics] 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. Šuhada, 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: observations galaxies: clusters: general galaxies: distances and redshifts Astrophysics - Cosmology and Extragalactic Astrophysics [SDU]Sciences of the Universe [physics] |
description |
International audience 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 from X-ray-selected cluster samples. |
author2 |
Institut d'Astrophysique de Paris (IAP) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
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. Šuhada, 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. Šuhada, 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 |
HAL CCSD |
publishDate |
2012 |
url |
https://hal.science/hal-03645708 https://doi.org/10.1088/0004-637X/761/1/22 |
genre |
South pole |
genre_facet |
South pole |
op_source |
ISSN: 0004-637X EISSN: 1538-4357 The Astrophysical Journal https://hal.science/hal-03645708 The Astrophysical Journal, 2012, 761, ⟨10.1088/0004-637X/761/1/22⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/arxiv/1207.4369 info:eu-repo/semantics/altIdentifier/doi/10.1088/0004-637X/761/1/22 hal-03645708 https://hal.science/hal-03645708 ARXIV: 1207.4369 BIBCODE: 2012ApJ.761.22S doi:10.1088/0004-637X/761/1/22 |
op_doi |
https://doi.org/10.1088/0004-637X/761/1/22 |
container_title |
The Astrophysical Journal |
container_volume |
761 |
container_issue |
1 |
container_start_page |
22 |
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1781706440351678464 |