South galactic cap u-Band sky survey (SCUSS): Data reduction

Hu Zou, Zhaoji Jiang, Xu Zhou, Zhenyu Wu, Jun Ma, Xiaohui Fan, Zhou Fan, Boliang He, Yipeng Jing, Michael Lesser, Cheng Li, Jundan Nie, Shiyin Shen, Jiali Wang, Tianmeng Zhang, Zhimin Zhou

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


The South Galactic Cap u-band Sky Survey (SCUSS) is a deep u-band imaging survey in the Southern Galactic Cap, using the 90Prime wide-field imager on the 2.3 Bok telescope at Kitt Peak. The survey observations started in 2010 and ended in 2013. The final survey area is about 5000 deg2 with a median 5σ point source limiting magnitude of ∼23.2. This paper describes the survey data reduction process, which includes basic imaging processing, astrometric and photometric calibrations, image stacking, and photometric measurements. Survey photometry is performed on objects detected both on SCUSS u-band images and in the SDSS database. Automatic, aperture, point-spread function (PSF), and model magnitudes are measured on stacked images. Co-added aperture, PSF, and model magnitudes are derived from measurements on single-epoch images. We also present comparisons of the SCUSS photometric catalog with those of the SDSS and Canada-France-Hawaii Telescope Legacy surveys.

Original languageEnglish (US)
Article number104
JournalAstronomical Journal
Issue number4
StatePublished - Oct 1 2015


  • catalogs
  • surveys
  • techniques: image processing
  • techniques: photometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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