Dark energy survey year 1 results: the photometric data set for cosmology
File(s)
Accepted version
Author(s)
Type
Journal Article
Abstract
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 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 $\sim 137$ million objects detected in co-added images covering $\sim 1800\,{\deg }^{2}$ in the DES grizY filters. The 10σ 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 lesssim 1.
Date Issued
2018-04-03
Date Acceptance
2018-03-01
Citation
The Astrophysical Journal Supplement, 2018, 235 (2), pp.1-35
ISSN
0067-0049
Publisher
American Astronomical Society
Start Page
1
End Page
35
Journal / Book Title
The Astrophysical Journal Supplement
Volume
235
Issue
2
Copyright Statement
© 2018. The American Astronomical Society. All rights reserved.
Identifier
https://iopscience.iop.org/article/10.3847/1538-4365/aab4f5
Subjects
astro-ph.CO
astro-ph.CO
astro-ph.IM
Astronomy & Astrophysics
0201 Astronomical and Space Sciences
0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
0306 Physical Chemistry (incl. Structural)
Publication Status
Published
Date Publish Online
2018-04-03