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Dark Energy Survey Year 3 results: calibration of lens sample redshift distributions using clustering redshifts with BOSS/eBOSS

Dark Energy Survey Year 3 results: calibration of lens sample redshift distributions using clustering redshifts with BOSS/eBOSS
Dark Energy Survey Year 3 results: calibration of lens sample redshift distributions using clustering redshifts with BOSS/eBOSS
We present clustering redshift measurements for Dark Energy Survey (DES) lens sample galaxies used in weak gravitational lensing and galaxy clustering studies. To perform these measurements, we cross-correlate with spectroscopic galaxies from the Baryon Acoustic Oscillation Survey (BOSS) and its extension, eBOSS. We validate our methodology in simulations, including a new technique to calibrate systematic errors that result from the galaxy clustering bias, and we find that our method is generally unbiased in calibrating the mean redshift. We apply our method to the data, and estimate the redshift distribution for 11 different photometrically selected bins. We find general agreement between clustering redshift and photometric redshift estimates, with differences on the inferred mean redshift found to be below |Δz| = 0.01 in most of the bins. We also test a method to calibrate a width parameter for redshift distributions, which we found necessary to use for some of our samples. Our typical uncertainties on the mean redshift ranged from 0.003 to 0.008, while our uncertainties on the width ranged from 4 to 9 per cent. We discuss how these results calibrate the photometric redshift distributions used in companion papers for DES Year 3 results.
cosmology: observations, galaxies: distances and redshifts, large-scale structure of Universe, surveys
1365-2966
5517-5539
Cawthon, R.
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Elvin-Poole, J.
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Porredon, A.
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Crocce, M.
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Giannini, G.
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Gatti, M.
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Ross, A. J.
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Sanchez, J.
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Castander, F. J.
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Choi, A.
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Costanzi, M.
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da Costa, L. N.
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Pereira, M. E. S.
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Dawson, K.
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Desai, S.
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Diehl, H. T.
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Ferrero, I.
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Fosalba, P.
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Frieman, J.
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García-Bellido, J.
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Gschwend, J.
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Gutierrez, G.
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et al.
Cawthon, R.
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Elvin-Poole, J.
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Porredon, A.
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Crocce, M.
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Giannini, G.
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Gatti, M.
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Ross, A. J.
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Rykoff, E. S.
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Bechtol, K.
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De Vicente, J.
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Brooks, D.
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Carrasco Kind, M.
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Carretero, J.
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Castander, F. J.
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Choi, A.
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Costanzi, M.
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da Costa, L. N.
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Pereira, M. E. S.
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Dawson, K.
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Desai, S.
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Diehl, H. T.
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Eckert, K.
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Everett, S.
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Ferrero, I.
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Fosalba, P.
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Frieman, J.
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García-Bellido, J.
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Gaztanaga, E.
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Gruendl, R. A.
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Gschwend, J.
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Gutierrez, G.
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Smith, M.
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Cawthon, R., Elvin-Poole, J., Porredon, A. and Smith, M. , et al. (2022) Dark Energy Survey Year 3 results: calibration of lens sample redshift distributions using clustering redshifts with BOSS/eBOSS. Monthly Notices Of The Royal Astronomical Society, 513 (4), 5517-5539. (doi:10.1093/mnras/stac1160).

Record type: Article

Abstract

We present clustering redshift measurements for Dark Energy Survey (DES) lens sample galaxies used in weak gravitational lensing and galaxy clustering studies. To perform these measurements, we cross-correlate with spectroscopic galaxies from the Baryon Acoustic Oscillation Survey (BOSS) and its extension, eBOSS. We validate our methodology in simulations, including a new technique to calibrate systematic errors that result from the galaxy clustering bias, and we find that our method is generally unbiased in calibrating the mean redshift. We apply our method to the data, and estimate the redshift distribution for 11 different photometrically selected bins. We find general agreement between clustering redshift and photometric redshift estimates, with differences on the inferred mean redshift found to be below |Δz| = 0.01 in most of the bins. We also test a method to calibrate a width parameter for redshift distributions, which we found necessary to use for some of our samples. Our typical uncertainties on the mean redshift ranged from 0.003 to 0.008, while our uncertainties on the width ranged from 4 to 9 per cent. We discuss how these results calibrate the photometric redshift distributions used in companion papers for DES Year 3 results.

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Accepted/In Press date: 22 April 2022
Published date: 1 July 2022
Additional Information: Publisher Copyright: © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.
Keywords: cosmology: observations, galaxies: distances and redshifts, large-scale structure of Universe, surveys

Identifiers

Local EPrints ID: 475634
URI: http://eprints.soton.ac.uk/id/eprint/475634
ISSN: 1365-2966
PURE UUID: 158f1625-de21-49ca-b7e7-9089663967cc
ORCID for M. Smith: ORCID iD orcid.org/0000-0002-3321-1432

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Date deposited: 23 Mar 2023 17:31
Last modified: 17 Mar 2024 03:36

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Contributors

Author: R. Cawthon
Author: J. Elvin-Poole
Author: A. Porredon
Author: M. Crocce
Author: G. Giannini
Author: M. Gatti
Author: A. J. Ross
Author: E. S. Rykoff
Author: A. Carnero Rosell
Author: J. DeRose
Author: S. Lee
Author: M. Rodriguez-Monroy
Author: A. Amon
Author: K. Bechtol
Author: J. De Vicente
Author: D. Gruen
Author: R. Morgan
Author: E. Sanchez
Author: J. Sanchez
Author: I. Sevilla-Noarbe
Author: T. M. C. Abbott
Author: M. Aguena
Author: S. Allam
Author: J. Annis
Author: S. Avila
Author: D. Bacon
Author: E. Bertin
Author: D. Brooks
Author: D. L. Burke
Author: M. Carrasco Kind
Author: J. Carretero
Author: F. J. Castander
Author: A. Choi
Author: M. Costanzi
Author: L. N. da Costa
Author: M. E. S. Pereira
Author: K. Dawson
Author: S. Desai
Author: H. T. Diehl
Author: K. Eckert
Author: S. Everett
Author: I. Ferrero
Author: P. Fosalba
Author: J. Frieman
Author: J. García-Bellido
Author: E. Gaztanaga
Author: R. A. Gruendl
Author: J. Gschwend
Author: G. Gutierrez
Author: M. Smith ORCID iD
Corporate Author: et al.

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