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Title: Dark Energy Survey Year 1 Results: Photometric Data Set for Cosmology

Here, 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 zeropoints, object catalogs, and ancillary data products -e.g., maps of survey depth and observing conditions, star-galaxy classification, and photometric redshift estimates|that are necessary for accurate cosmological analyses. The Y1A1 GOLD wide-area object catalog consists of 137 million objects detected in coadded images covering 1800 deg 2 in the DES grizY filters. The 10 limiting magnitude for galaxies is g = 23.4, r = 23.2, i = 22.5, z = 21.8, and Y = 20.1. We also performed photometric calibration of Y1A1 GOLD by combining nightly zeropoint 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.
Authors:
 [1]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States). et al
Publication Date:
Report Number(s):
BNL-114276-2017-JA; FERMILAB-PUB-17-180-AE; arXiv:1708.01531
Journal ID: ISSN 0067-0049
Grant/Contract Number:
SC0012704; AC05-00OR22725; AC02-07CH11359; AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Astrophysical Journal, Supplement Series
Additional Journal Information:
Journal Volume: 235; Journal Issue: 2; Journal ID: ISSN 0067-0049
Publisher:
American Astronomical Society
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Orgs:
DES Collaboration
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; surveys; catalogs; techniques: image processing; techniques: photometric; cosmology: observations; image processing; photometric; cosmology observations; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
OSTI Identifier:
1436085
Alternate Identifier(s):
OSTI ID: 1389251; OSTI ID: 1435205; OSTI ID: 1437985

Drlica-Wagner, A. Dark Energy Survey Year 1 Results: Photometric Data Set for Cosmology. United States: N. p., Web. doi:10.3847/1538-4365/aab4f5.
Drlica-Wagner, A. Dark Energy Survey Year 1 Results: Photometric Data Set for Cosmology. United States. doi:10.3847/1538-4365/aab4f5.
Drlica-Wagner, A. 2018. "Dark Energy Survey Year 1 Results: Photometric Data Set for Cosmology". United States. doi:10.3847/1538-4365/aab4f5.
@article{osti_1436085,
title = {Dark Energy Survey Year 1 Results: Photometric Data Set for Cosmology},
author = {Drlica-Wagner, A.},
abstractNote = {Here, 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 zeropoints, object catalogs, and ancillary data products -e.g., maps of survey depth and observing conditions, star-galaxy classification, and photometric redshift estimates|that are necessary for accurate cosmological analyses. The Y1A1 GOLD wide-area object catalog consists of 137 million objects detected in coadded images covering 1800 deg2 in the DES grizY filters. The 10 limiting magnitude for galaxies is g = 23.4, r = 23.2, i = 22.5, z = 21.8, and Y = 20.1. We also performed photometric calibration of Y1A1 GOLD by combining nightly zeropoint 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.},
doi = {10.3847/1538-4365/aab4f5},
journal = {Astrophysical Journal, Supplement Series},
number = 2,
volume = 235,
place = {United States},
year = {2018},
month = {4}
}