We perform an analysis in harmonic space of the Dark Energy Survey Year 1 Data (DES-Y1) galaxy clustering photometric data using products obtained for the real-space analysis. We test our pipeline with a suite of lognormal simulations, which are used to validate scale cuts in harmonic space as well as to provide a covariance matrix that takes into account the DES-Y1 mask. We then apply this pipeline to DES-Y1 data taking into account survey property maps derived for the real-space analysis. We compare with real-space DES-Y1 results obtained from a similar pipeline. We show that the harmonic space analysis we develop yields results that are compatible with the real-space analysis for the bias parameters. This verification paves the way to performing a harmonic space analysis for the upcoming DES-Y3 data.

Original languageEnglish
Pages (from-to)5714-5724
Number of pages11
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
Early online date10 Jun 2021
Publication statusPublished - 1 Aug 2021


  • Cosmology: observations
  • Large-scale structure of Universe
  • UKRI
  • STFC

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