Sánchez, C;
Alarcon, A;
Bernstein, GM;
Sanchez, J;
Pandey, S;
Raveri, M;
Prat, J;
... To, C; + view all
(2023)
The Dark Energy Survey Year 3 high-redshift sample: selection, characterization, and analysis of galaxy clustering.
Monthly Notices of the Royal Astronomical Society
, 525
(3)
pp. 3896-3922.
10.1093/mnras/stad2402.
Preview |
Text
stad2402.pdf - Published Version Download (4MB) | Preview |
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. The analysis of galaxy clustering measurements, with a total signal to noise S/N ∼70 after scale cuts, yields robust cosmological constraints on a combination of the fraction of matter in the Universe.
| Type: | Article |
|---|---|
| Title: | The Dark Energy Survey Year 3 high-redshift sample: selection, characterization, and analysis of galaxy clustering |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stad2402 |
| Publisher version: | https://doi.org/10.1093/mnras/stad2402 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | galaxies: high-redshift, cosmological parameters, large-scale structure of Universe |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10179210 |
Archive Staff Only
 |
View Item |
