Dark energy survey year 3 results: weak lensing shape catalogue

DES Collaboration, S. Avila, D. Bacon, D. Thomas

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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 languageEnglish
Pages (from-to)4312-4336
Number of pages25
JournalMonthly Notices of the Royal Astronomical Society
Volume504
Issue number3
Early online date5 Apr 2021
DOIs
Publication statusPublished - 1 Jul 2021

Keywords

  • catalogues
  • cosmology: observations
  • gravitational lensing: weak
  • methods: data analysis
  • surveys
  • techniques: image processing

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