Authors
Gatti, M. ; Sheldon, E.; Amon, A. ; Becker, M. R.; Troxel, M.; Choi, A.; Doux, C.; MacCrann, N.; Navarro-Alsina, A.; Harrison, I.
Abstract
We present and characterise the galaxy shape catalogue from the first 3 years 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 shearmeasurement 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 aweighted source number density of eff = 5.59 gal/arcmin2and corresponding shape noise = 0.261. We perform a battery ofinternal 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.