The Blanco Cosmology Survey: Data Acquisition, Processing, Calibration, Quality Diagnostics, and Data Release
International audience The Blanco Cosmology Survey (BCS) is a 60 night imaging survey of ~80 deg 2 of the southern sky located in two fields: (α, δ) = (5 hr, -55°) and (23 hr, -55°). The survey was carried out between 2005 and 2008 in griz bands with the Mosaic2 imager on the Blanco 4 m telescope. T...
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ftsorbonneuniv:oai:HAL:hal-03645778v1 2024-09-09T20:09:09+00:00 The Blanco Cosmology Survey: Data Acquisition, Processing, Calibration, Quality Diagnostics, and Data Release Desai, S. Armstrong, R. Mohr, J. J. Semler, D. R. Liu, J. Bertin, E. Allam, S. S. Barkhouse, W. A. Bazin, G. Buckley-Geer, E. J. Cooper, M. C. Hansen, S. M. High, F. W. Lin, H. Lin, Y. -T. Ngeow, C. -C. Rest, A. Song, J. Tucker, D. Zenteno, A. 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-03645778 https://doi.org/10.1088/0004-637X/757/1/83 en eng HAL CCSD American Astronomical Society info:eu-repo/semantics/altIdentifier/arxiv/1204.1210 info:eu-repo/semantics/altIdentifier/doi/10.1088/0004-637X/757/1/83 hal-03645778 https://hal.science/hal-03645778 ARXIV: 1204.1210 BIBCODE: 2012ApJ.757.83D doi:10.1088/0004-637X/757/1/83 ISSN: 0004-637X EISSN: 1538-4357 The Astrophysical Journal https://hal.science/hal-03645778 The Astrophysical Journal, 2012, 757, ⟨10.1088/0004-637X/757/1/83⟩ cosmology: observations galaxies: clusters: general methods: data analysis surveys techniques: image processing Astrophysics - Cosmology and Extragalactic Astrophysics [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2012 ftsorbonneuniv https://doi.org/10.1088/0004-637X/757/1/83 2024-07-25T23:47:50Z International audience The Blanco Cosmology Survey (BCS) is a 60 night imaging survey of ~80 deg 2 of the southern sky located in two fields: (α, δ) = (5 hr, -55°) and (23 hr, -55°). The survey was carried out between 2005 and 2008 in griz bands with the Mosaic2 imager on the Blanco 4 m telescope. The primary aim of the BCS survey is to provide the data required to optically confirm and measure photometric redshifts for Sunyaev-Zel'dovich effect selected galaxy clusters from the South Pole Telescope and the Atacama Cosmology Telescope. We process and calibrate the BCS data, carrying out point-spread function-corrected model-fitting photometry for all detected objects. The median 10σ galaxy (point-source) depths over the survey in griz are approximately 23.3 (23.9), 23.4 (24.0), 23.0 (23.6), and 21.3 (22.1), respectively. The astrometric accuracy relative to the USNO-B survey is ~45 mas. We calibrate our absolute photometry using the stellar locus in grizJ bands, and thus our absolute photometric scale derives from the Two Micron All Sky Survey, which has ~2% accuracy. The scatter of stars about the stellar locus indicates a systematic floor in the relative stellar photometric scatter in griz that is ~1.9%, ~2.2%, ~2.7%, and ~2.7%, respectively. A simple cut in the AstrOmatic star-galaxy classifier spread_model produces a star sample with good spatial uniformity. We use the resulting photometric catalogs to calibrate photometric redshifts for the survey and demonstrate scatter δz/(1 + z) = 0.054 with an outlier fraction η < 5% to z ~ 1. We highlight some selected science results to date and provide a full description of the released data products. Article in Journal/Newspaper South pole HAL Sorbonne Université Blanco ENVELOPE(-55.233,-55.233,-61.250,-61.250) South Pole The Astrophysical Journal 757 1 83 |
institution |
Open Polar |
collection |
HAL Sorbonne Université |
op_collection_id |
ftsorbonneuniv |
language |
English |
topic |
cosmology: observations galaxies: clusters: general methods: data analysis surveys techniques: image processing Astrophysics - Cosmology and Extragalactic Astrophysics [SDU]Sciences of the Universe [physics] |
spellingShingle |
cosmology: observations galaxies: clusters: general methods: data analysis surveys techniques: image processing Astrophysics - Cosmology and Extragalactic Astrophysics [SDU]Sciences of the Universe [physics] Desai, S. Armstrong, R. Mohr, J. J. Semler, D. R. Liu, J. Bertin, E. Allam, S. S. Barkhouse, W. A. Bazin, G. Buckley-Geer, E. J. Cooper, M. C. Hansen, S. M. High, F. W. Lin, H. Lin, Y. -T. Ngeow, C. -C. Rest, A. Song, J. Tucker, D. Zenteno, A. The Blanco Cosmology Survey: Data Acquisition, Processing, Calibration, Quality Diagnostics, and Data Release |
topic_facet |
cosmology: observations galaxies: clusters: general methods: data analysis surveys techniques: image processing Astrophysics - Cosmology and Extragalactic Astrophysics [SDU]Sciences of the Universe [physics] |
description |
International audience The Blanco Cosmology Survey (BCS) is a 60 night imaging survey of ~80 deg 2 of the southern sky located in two fields: (α, δ) = (5 hr, -55°) and (23 hr, -55°). The survey was carried out between 2005 and 2008 in griz bands with the Mosaic2 imager on the Blanco 4 m telescope. The primary aim of the BCS survey is to provide the data required to optically confirm and measure photometric redshifts for Sunyaev-Zel'dovich effect selected galaxy clusters from the South Pole Telescope and the Atacama Cosmology Telescope. We process and calibrate the BCS data, carrying out point-spread function-corrected model-fitting photometry for all detected objects. The median 10σ galaxy (point-source) depths over the survey in griz are approximately 23.3 (23.9), 23.4 (24.0), 23.0 (23.6), and 21.3 (22.1), respectively. The astrometric accuracy relative to the USNO-B survey is ~45 mas. We calibrate our absolute photometry using the stellar locus in grizJ bands, and thus our absolute photometric scale derives from the Two Micron All Sky Survey, which has ~2% accuracy. The scatter of stars about the stellar locus indicates a systematic floor in the relative stellar photometric scatter in griz that is ~1.9%, ~2.2%, ~2.7%, and ~2.7%, respectively. A simple cut in the AstrOmatic star-galaxy classifier spread_model produces a star sample with good spatial uniformity. We use the resulting photometric catalogs to calibrate photometric redshifts for the survey and demonstrate scatter δz/(1 + z) = 0.054 with an outlier fraction η < 5% to z ~ 1. We highlight some selected science results to date and provide a full description of the released data products. |
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 |
Desai, S. Armstrong, R. Mohr, J. J. Semler, D. R. Liu, J. Bertin, E. Allam, S. S. Barkhouse, W. A. Bazin, G. Buckley-Geer, E. J. Cooper, M. C. Hansen, S. M. High, F. W. Lin, H. Lin, Y. -T. Ngeow, C. -C. Rest, A. Song, J. Tucker, D. Zenteno, A. |
author_facet |
Desai, S. Armstrong, R. Mohr, J. J. Semler, D. R. Liu, J. Bertin, E. Allam, S. S. Barkhouse, W. A. Bazin, G. Buckley-Geer, E. J. Cooper, M. C. Hansen, S. M. High, F. W. Lin, H. Lin, Y. -T. Ngeow, C. -C. Rest, A. Song, J. Tucker, D. Zenteno, A. |
author_sort |
Desai, S. |
title |
The Blanco Cosmology Survey: Data Acquisition, Processing, Calibration, Quality Diagnostics, and Data Release |
title_short |
The Blanco Cosmology Survey: Data Acquisition, Processing, Calibration, Quality Diagnostics, and Data Release |
title_full |
The Blanco Cosmology Survey: Data Acquisition, Processing, Calibration, Quality Diagnostics, and Data Release |
title_fullStr |
The Blanco Cosmology Survey: Data Acquisition, Processing, Calibration, Quality Diagnostics, and Data Release |
title_full_unstemmed |
The Blanco Cosmology Survey: Data Acquisition, Processing, Calibration, Quality Diagnostics, and Data Release |
title_sort |
blanco cosmology survey: data acquisition, processing, calibration, quality diagnostics, and data release |
publisher |
HAL CCSD |
publishDate |
2012 |
url |
https://hal.science/hal-03645778 https://doi.org/10.1088/0004-637X/757/1/83 |
long_lat |
ENVELOPE(-55.233,-55.233,-61.250,-61.250) |
geographic |
Blanco South Pole |
geographic_facet |
Blanco South Pole |
genre |
South pole |
genre_facet |
South pole |
op_source |
ISSN: 0004-637X EISSN: 1538-4357 The Astrophysical Journal https://hal.science/hal-03645778 The Astrophysical Journal, 2012, 757, ⟨10.1088/0004-637X/757/1/83⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/arxiv/1204.1210 info:eu-repo/semantics/altIdentifier/doi/10.1088/0004-637X/757/1/83 hal-03645778 https://hal.science/hal-03645778 ARXIV: 1204.1210 BIBCODE: 2012ApJ.757.83D doi:10.1088/0004-637X/757/1/83 |
op_doi |
https://doi.org/10.1088/0004-637X/757/1/83 |
container_title |
The Astrophysical Journal |
container_volume |
757 |
container_issue |
1 |
container_start_page |
83 |
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1809943274032463872 |