THE BLANCO COSMOLOGY SURVEY: DATA ACQUISITION, PROCESSING, CALIBRATION, QUALITY DIAGNOSTICS, AND DATA RELEASE
THE BLANCO COSMOLOGY SURVEY: DATA ACQUISITION, PROCESSING, CALIBRATION, QUALITY DIAGNOSTICS, AND DATA RELEASE
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DOI：
10.1088/0004-637x/757/1/83
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发表时间：
2012-04
期刊：
影响因子：
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通讯作者：
S. Desai;R. Armstrong;J. J. Mohr-J.;D. R. Semler;J. Liu;E. Bertin;S. Allam;W. Barkhouse;G. Bazin;E. Buckley-Geer;M. C. Cooper;S. Hansen;F. W. High;Huan Lin;Yen-Ting Lin;Yen-Ting Lin;C. Ngeow;A. Rest;J. Song;D. Tucker;A. Zenteno
中科院分区：
文献类型：
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作者：
S. Desai;R. Armstrong;J. J. Mohr-J.;D. R. Semler;J. Liu;E. Bertin;S. Allam;W. Barkhouse;G. Bazin;E. Buckley-Geer;M. C. Cooper;S. Hansen;F. W. High;Huan Lin;Yen-Ting Lin;Yen-Ting Lin;C. Ngeow;A. Rest;J. Song;D. Tucker;A. Zenteno
布兰科宇宙学巡天（BCS）是一个60个夜晚的成像巡天，位于两个区域：（α，δ）=（5小时，−55°）和（23小时，−55°）。该调查是在2005年至2008年期间进行的，使用布兰科4米望远镜上的Mosaic 2成像仪。BCS巡天的主要目的是提供所需数据，以便从南极望远镜和阿塔卡马宇宙学望远镜中光学确认和测量Sunyaev-Zel'dovich效应选定的星系团的光度红移。我们处理和校准BCS数据，进行点扩散函数校正模型拟合测光的所有检测对象。在格里兹的调查中，10σ星系（点源）的平均深度分别约为23.3（23.9）、23.4（24.0）、23.0（23.6）和21.3（22.1）。相对于USNO-B巡天的天体测量精度为1.45 mas。我们使用grizJ波段的恒星轨迹校准我们的绝对测光，因此我们的绝对测光刻度来自2微米全天巡天，其精度为1.2%。恒星在恒星轨迹周围的散射表明，在格里兹的相对恒星光度散射中，系统底分别为1.9%、1.2%、1.2%和1.2%。Astronomatic恒星-星系分类器spread_model中的一个简单切割产生了具有良好空间均匀性的星星样本。我们使用由此产生的光度星表来校准巡天的光度红移，并证明散射δz/（1 + z）= 0.054，离群分数η < 5%至z <1。我们重点介绍了一些迄今为止选定的科学成果，并提供了已发布的数据产品的完整描述。
The Blanco Cosmology Survey (BCS) is a 60 night imaging survey of ∼80 deg2 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.