Abstract
We present and characterize the galaxy shape catalogue from the first 3 yr of Dark Energy Survey (DES) observations, over an effective area of 4143 deg2 of the southern sky. We describe our data analysis process and our self-calibrating shear measurement pipeline metacalibration, which builds and improves upon the pipeline used in the DES Year 1 analysis in several aspects. The DES Year 3 weak-lensing shape catalogue consists of 100 204 026 galaxies, measured in the riz bands, resulting in a weighted source number density of neff = 5.59 gal arcmin-2 and corresponding shape noise σe = 0.261. We perform a battery of internal null tests on the catalogue, including tests on systematics related to the point spread function (PSF) modelling, spurious catalogue B-mode signals, catalogue contamination, and galaxy properties.
Original language | English (US) |
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Pages (from-to) | 4312-4336 |
Number of pages | 25 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 504 |
Issue number | 3 |
DOIs | |
State | Published - Jul 1 2021 |
Keywords
- catalogues
- cosmology: observations
- gravitational lensing: weak
- methods: data analysis
- surveys
- techniques: image processing
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science