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


Type
Article
Change log
Authors
Drlica-Wagner, A 
Sevilla-Noarbe, I 
Rykoff, ES 
Gruendl, RA 
Yanny, B 
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 ∼137 million objects detected in co-added images covering ∼1800deg2 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.

Description
Keywords
catalogs, cosmology: observations, surveys, techniques: image processing, techniques: photometric
Journal Title
Astrophysical Journal, Supplement Series
Conference Name
Journal ISSN
0067-0049
1538-4365
Volume Title
235
Publisher
IOP Publishing
Sponsorship
PPARC (via University College London (UCL)) (CJAAM)
Science and Technology Facilities Council (ST/K000985/1)
Science and Technology Facilities Council (ST/N000927/1)
Multiple funders including STFC listed on paper.