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Article Dans Une Revue The Astrophysical Journal Année : 2012

The Blanco Cosmology Survey: Data Acquisition, Processing, Calibration, Quality Diagnostics, and Data Release

S. Desai
  • Fonction : Auteur
R. Armstrong
  • Fonction : Auteur
J. J. Mohr
  • Fonction : Auteur
D. R. Semler
  • Fonction : Auteur
J. Liu
  • Fonction : Auteur
S. S. Allam
  • Fonction : Auteur
W. A. Barkhouse
  • Fonction : Auteur
G. Bazin
  • Fonction : Auteur
E. J. Buckley-Geer
  • Fonction : Auteur
M. C. Cooper
  • Fonction : Auteur
S. M. Hansen
  • Fonction : Auteur
F. W. High
  • Fonction : Auteur
H. Lin
  • Fonction : Auteur
Y. -T. Lin
  • Fonction : Auteur
C. -C. Ngeow
  • Fonction : Auteur
A. Rest
  • Fonction : Auteur
J. Song
  • Fonction : Auteur
D. Tucker
  • Fonction : Auteur
A. Zenteno
  • Fonction : Auteur

Résumé

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.

Dates et versions

hal-03645778 , version 1 (19-04-2022)

Identifiants

Citer

S. Desai, R. Armstrong, J. J. Mohr, D. R. Semler, J. Liu, et al.. The Blanco Cosmology Survey: Data Acquisition, Processing, Calibration, Quality Diagnostics, and Data Release. The Astrophysical Journal, 2012, 757, ⟨10.1088/0004-637X/757/1/83⟩. ⟨hal-03645778⟩
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