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Dark energy survey year 3 results: Galaxy sample for BAO measurement

Rosell, AC; Rodriguez-Monroy, M; Crocce, M; Elvin-Poole, J; Porredon, A; Ferrero, I; Mena-Fernández, J; ... Suchyta, E; + view all (2022) Dark energy survey year 3 results: Galaxy sample for BAO measurement. Monthly Notices of the Royal Astronomical Society , 509 (1) pp. 778-799. 10.1093/mnras/stab2995. Green open access

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Abstract

In this paper, we present and validate the galaxy sample used for the analysis of the baryon acoustic oscillation (BAO) signal in the Dark Energy Survey (DES) Y3 data. The definition is based on a colour and redshift-dependent magnitude cut optimized to select galaxies at redshifts higher than 0.5, while ensuring a high-quality determination. The sample covers ~4100 deg2 to a depth of i = 22.3 (AB) at 10s. It contains 7031 993 galaxies in the redshift range from z = 0.6 to 1.1, with a mean effective redshift of 0.835. Redshifts are estimated with the machine learning algorithm DNF, and are validated using the VIPERS PDR2 sample. We find a mean redshift bias of zbias~0.01 and a mean uncertainty, in units of 1 + z, of σ68~0.03. We evaluate the galaxy population of the sample, showing it is mostly built upon Elliptical to Sbc types. Furthermore, we find a low level of stellar contamination of ≤ 4 per cent. We present the method used to mitigate the effect of spurious clustering coming from observing conditions and other large-scale systematics.We apply it to the BAO sample and calculate weights that are used to get a robust estimate of the galaxy clustering signal. This paper is one of a series dedicated to the analysis of the BAO signal in DES Y3. In the companion papers, we present the galaxy mock catalogues used to calibrate the analysis and the angular diameter distance constraints obtained through the fitting to the BAO scale.

Type: Article
Title: Dark energy survey year 3 results: Galaxy sample for BAO measurement
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnras/stab2995
Publisher version: https://doi.org/10.1093/mnras/stab2995
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: Catalogues, surveys, cosmology: observations, cosmology: 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.ucl.ac.uk/id/eprint/10141379
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