In:
The Astrophysical Journal Supplement Series, American Astronomical Society, Vol. 254, No. 2 ( 2021-06-01), p. 24-
Kurzfassung:
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 deg 2 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 i AB ∼ 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 〈 i AB 〈 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.
Materialart:
Online-Ressource
ISSN:
0067-0049
,
1538-4365
DOI:
10.3847/1538-4365/abeb66
Sprache:
Unbekannt
Verlag:
American Astronomical Society
Publikationsdatum:
2021
ZDB Id:
2006860-8
ZDB Id:
2207650-5
SSG:
16,12
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