TY - JOUR
T1 - Dark energy survey year 3 results
T2 - Galaxy sample for BAO measurement
AU - Rosell, A. Carnero
AU - Rodriguez-Monroy, M.
AU - Crocce, M.
AU - Elvin-Poole, J.
AU - Porredon, A.
AU - Ferrero, I.
AU - Mena-Fernández, J.
AU - Cawthon, R.
AU - De Vicente, J.
AU - Gaztanaga, E.
AU - Ross, A. J.
AU - Sanchez, E.
AU - Sevilla-Noarbe, I.
AU - Alves, O.
AU - Andrade-Oliveira, F.
AU - Asorey, J.
AU - Avila, S.
AU - Brandao-Souza, A.
AU - Camacho, H.
AU - Chan, K. C.
AU - Ferté, A.
AU - Muir, J.
AU - Riquelme, W.
AU - Rosenfeld, R.
AU - Cid, D. Sanchez
AU - Hartley, W. G.
AU - Weaverdyck, N.
AU - Abbott, T.
AU - Aguena, M.
AU - Allam, S.
AU - Annis, J.
AU - Bertin, E.
AU - Brooks, D.
AU - Buckley-Geer, E.
AU - Burke, D.
AU - Calcino, J.
AU - Carollo, D.
AU - Kind, M. Carrasco
AU - Carretero, J.
AU - Castander, F.
AU - Choi, A.
AU - Conselice, C.
AU - Costanzi, M.
AU - Davis, T.
AU - Lidman, C.
AU - Malik, U.
AU - Moller, A.
AU - Sharp, R.
AU - Smith, M.
AU - Tucker, B.
N1 - Publisher Copyright:
© 2021 The Author(s).
PY - 2022/1/1
Y1 - 2022/1/1
N2 - 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.
AB - 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.
KW - Catalogues
KW - Cosmology: large-scale structure of Universe
KW - Cosmology: observations
KW - Surveys
UR - http://www.scopus.com/inward/record.url?scp=85121245425&partnerID=8YFLogxK
U2 - 10.1093/mnras/stab2995
DO - 10.1093/mnras/stab2995
M3 - Article
SN - 0035-8711
VL - 509
SP - 778
EP - 799
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 1
ER -