Dark Energy Survey Year 3 Results: Weak Lensing Shape Catalogue Academic Article uri icon

abstract

  • 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.

altmetric score

  • 7.83

author list (cited authors)

  • Gatti, M., Sheldon, E., Amon, A., Becker, M., Troxel, M., Choi, A., ... Wilkinson, R. D.

citation count

  • 1

publication date

  • April 2021