The Blanco cosmology survey: Data acquisition, processing, calibration, quality diagnostics, and data release

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/100861

Title:	The Blanco cosmology survey: Data acquisition, processing, calibration, quality diagnostics, and data release
Authors:	饒兆聰;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.
Contributors:	理學院天文研究所
Keywords:	[SDU]Sciences of the Universe [physics];Astrophysics - Cosmology and Extragalactic Astrophysics;Astrophysics - Cosmology and Nongalactic Astrophysics;Cosmology and Nongalactic Astrophysics (astro-ph.CO);cosmology: observations;FOS: Physical sciences;galaxies: clusters: general;methods: data analysis;surveys;techniques: image processing
Date:	2012-09-20
Issue Date:	2026-04-21 14:16:32 (UTC+8)
Publisher:	IOP Publishing Ltd.;American Astronomical Society
Abstract:	摘要： The Blanco Cosmology Survey (BCS) is a 60 night imaging survey of $\sim$80 deg$^2$ of the southern sky located in two fields: ($ $,$ $)= (5 hr, $-55^{\circ}$) and (23 hr, $-55^{\circ}$). The survey was carried out between 2005 and 2008 in $griz$ bands with the Mosaic2 imager on the Blanco 4m 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 PSF corrected model fitting photometry for all detected objects. The median 10$ $ 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 $\sim45$ milli-arcsec. We calibrate our absolute photometry using the stellar locus in $grizJ$ bands, and thus our absolute photometric scale derives from 2MASS which has $\sim2$% accuracy. The scatter of stars about the stellar locus indicates a systematics floor in the relative stellar photometric scatter in $griz$ that is $\sim$1.9%, $\sim$2.2%, $\sim$2.7% and$\sim$2.7%, respectively. A simple cut in the AstrOmatic star-galaxy classifier {\tt 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 $ z/(1+z)=0.054$ with an outlier fraction $ <5$% to $z\sim1$. We highlight some selected science results to date and provide a full description of the released data products. 23 pages, 23 figures . Response to referee comments. Paper accepted for publication. BCS catalogs and images available for download from http://www.usm.uni-muenchen.de/BCS 出版者： American Astronomical Society 出版日期： 2012-09-06 出處： The Astrophysical Journal, 2012-09, Vol.757 (1), p.83- 資源來源： Institute of Physics Journals 識別號： ISSN: 0004-637X 識別號： EISSN: 1538-4357 識別號： DOI: 10.1088/0004-637x/757/1/83 識別號： DOI: 10.48550/arxiv.1204.1210
Appears in Collections:	[Graduate Institute of Astronomy] journal & Dissertation

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