2012ApJ...757...83D -
Astrophys. J., 757, 83 (2012/September-3)
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. and ZENTENO A.
Abstract (from CDS):
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.
Abstract Copyright:
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Journal keyword(s):
cosmology: observations - galaxies: clusters: general - methods: data analysis - surveys - techniques: image processing
VizieR on-line data:
<Available at CDS (J/ApJ/757/83): bcs05hr.dat bcs23hr.dat>
Status at CDS
:
Examining the need for a new acronym.
Simbad objects:
2
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