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Dark Energy Survey - K Romer.pdf (10.82 MB)

Dark Energy Survey year 3 results: photometric data set for cosmology

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journal contribution
posted on 2023-06-10, 00:47 authored by I Sevilla-Noarbe, K Bechtol, M Carrasco Kind, A Carnero Rosell, M R Becker, A Drlica-Wagner, R A Gruendl, E S Rykoff, E Sheldon, B Yanny, A Alarcon, S Allam, Sunayana Bhargava, Kathy RomerKathy Romer, Reese WilkinsonReese Wilkinson, DES Collaboration, others
We describe the Dark Energy Survey (DES) photometric data set assembled from the first three years of science operations to support DES Year 3 cosmologic analyses, and provide usage notes aimed at the broad astrophysics community. Y3 GOLD improves on previous releases from DES, Y1 GOLD, and Data Release 1 (DES DR1), presenting an expanded and curated data set that incorporates algorithmic developments in image detrending and processing, photometric calibration, and object classification. Y3 GOLD comprises nearly 5000 deg2 of grizY imaging in the south Galactic cap, including nearly 390 million objects, with depth reaching a signal-to-noise ratio ~10 for extended objects up to iAB ~ 23.0, and top-of-the-atmosphere photometric uniformity <3 mmag. Compared to DR1, photometric residuals with respect to Gaia are reduced by 50%, and per-object chromatic corrections are introduced. Y3 GOLD augments DES DR1 with simultaneous fits to multi-epoch photometry for more robust galactic color measurements and corresponding photometric redshift estimates. Y3 GOLD features improved morphological star–galaxy classification with efficiency >98% and purity >99% for galaxies with 19 < iAB < 22.5. Additionally, it includes per-object quality information, and accompanying maps of the footprint coverage, masked regions, imaging depth, survey conditions, and astrophysical foregrounds that are used to select the cosmologic analysis samples.

History

Publication status

  • Published

File Version

  • Accepted version

Journal

Astrophysical Journal, Supplement Series

ISSN

0067-0049

Publisher

IOP Publishing

Issue

2

Volume

254

Article number

a24

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2021-08-31

First Open Access (FOA) Date

2022-05-18

First Compliant Deposit (FCD) Date

2021-08-27

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