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.
Preview |
Text
stab2995.pdf - Published Version Download (4MB) | Preview |
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 |
Archive Staff Only
 |
View Item |
