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

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posted on 2023-06-09, 13:17 authored by A Drlica-Wagner, I Sevilla-Noarbe, E S Rykoff, R A Greundl, B Yanny, D L Tucker, B Hoyle, A Carnero Rosell, G M Bernstein, K Bechtol, M R Becker, A Benoit-Lévy, E Bertin, M Carrasco Kind, C Davis, J de Vicente, H T Diehl, D Gruen, W G Hartley, B Leistedt, T S Li, J L Marshall, E Neilsen, M M Rau, E Sheldon, J Smith, M A Troxel, S Wyatt, Y Zhang, Kathy RomerKathy Romer, The DES Collaboration and
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 ~1800deg^2 in the DES grizY filters. The 10s 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.

Funding

University of Sussex Astronomy Consolidated Grant 2017-2020; G2050; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/P000525/1

History

Publication status

  • Published

File Version

  • Published version

Journal

Astrophysical Journal Supplement Series

ISSN

0067-0049

Publisher

American Astronomical Society

Issue

33

Volume

235

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2018-05-15

First Open Access (FOA) Date

2018-05-15

First Compliant Deposit (FCD) Date

2018-05-14

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