The Dark Energy Survey Year 3 high-redshift sample: Selection, characterization, and analysis of galaxy clustering

(DES Collaboration)

Research output: Contribution to journalArticlepeer-review

Abstract

The fiducial cosmological analyses of imaging surveys like DES typically probe the Universe at redshifts z < 1. We present the selection and characterization of high-redshift galaxy samples using DES Year 3 data, and the analysis of their galaxy clustering measurements. In particular, we use galaxies that are fainter than those used in the previous DES Year 3 analyses and a Bayesian redshift scheme to define three tomographic bins with mean redshifts around z ∼0.9, 1.2, and 1.5, which extend the redshift coverage of the fiducial DES Year 3 analysis. These samples contain a total of about 9 million galaxies, and their galaxy density is more than 2 times higher than those in the DES Year 3 fiducial case. We characterize the redshift uncertainties of the samples, including the usage of various spectroscopic and high-quality redshift samples, and we develop a machine-learning method to correct for correlations between galaxy density and survey observing conditions.

Original languageEnglish (US)
Pages (from-to)3896-3922
Number of pages27
JournalMonthly Notices of the Royal Astronomical Society
Volume525
Issue number3
DOIs
StatePublished - Nov 1 2023

Keywords

  • cosmological parameters
  • galaxies: high-redshift
  • large-scale structure of Universe

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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