Dark energy survey year 1 results: The photometric data set for cosmology

DES Collaboration

Research output: Contribution to journalReview articlepeer-review


We describe the creation, content, and validation of the Dark Energy Survey (DES) internal year-one cosmology data set, Y1A1 GOLD, in support of upcoming cosmological analyses. The Y1A1 GOLD data set is assembled from multiple epochs of DES imaging and consists of calibrated photometric zero-points, object catalogs, and ancillary data productsiXe.g., maps of survey depth and observing conditions, stariVgalaxy classification, and photometric redshift estimatesiXthat are necessary for accurate cosmological analyses. The Y1A1 GOLD widearea object catalog consists of ~137 million objects detected in co-added images covering ~1800 deg2 in the DES grizY filters. The 10£m limiting magnitude for galaxies is g = 23.4, r = 23.2, i = 22.5, z = 21.8, and Y = 20.1. Photometric calibration of Y1A1 GOLD was performed by combining nightly zero-point solutions with stellar locus regression, and the absolute calibration accuracy is better than 2% over the survey area. DES Y1A1 GOLD is the largest photometric data set at the achieved depth to date, enabling precise measurements of cosmic acceleration at z≲1.

Original languageEnglish (US)
Article number33
JournalAstrophysical Journal, Supplement Series
Issue number2
StatePublished - Apr 2018


  • catalogs
  • cosmology: Observations
  • surveys
  • techniques: Image processing
  • techniques: Photometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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