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Dark Energy Survey Year 1 Results: Calibration of redMaGiC redshift distributions in DES and SDSS from cross-correlations

Dark Energy Survey Year 1 Results: Calibration of redMaGiC redshift distributions in DES and SDSS from cross-correlations
Dark Energy Survey Year 1 Results: Calibration of redMaGiC redshift distributions in DES and SDSS from cross-correlations

We present calibrations of the redshift distributions of redMaGiC galaxies in the Dark Energy Survey Year 1 (DES Y1) and Sloan Digital Sky Survey (SDSS) DR8 data. These results determine the priors of the redshift distribution of redMaGiC galaxies, which were used for galaxy clustering measurements and as lenses for galaxy-galaxy lensing measurements in DES Y1 cosmological analyses.We empirically determine the bias in redMaGiC photometric redshift estimates using angular cross-correlations with Baryon Oscillation Spectroscopic Survey (BOSS) galaxies. For DES, we calibrate a single-parameter redshift bias in three photometric redshift bins: z ∈ [0.15, 0.3], [0.3,0.45], and [0.45,0.6]. Our best-fit results in each bin give photometric redshift biases of |Δz| < 0.01. To further test the redMaGiC algorithm, we apply our calibration procedure to SDSS redMaGiC galaxies, where the statistical precision of the cross-correlation measurement is much higher due to a greater overlap with BOSS galaxies. For SDSS, we also find best-fit results of |Δz| < 0.01. We compare our results to other analyses of redMaGiC photometric redshifts.

Galaxies: distances and redshifts, Large-scale structure of Universe, Surveys
1365-2966
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Davis, C.
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Gatti, M.
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Smith, M. , DES Collaboration (2018) Dark Energy Survey Year 1 Results: Calibration of redMaGiC redshift distributions in DES and SDSS from cross-correlations. Monthly Notices of the Royal Astronomical Society, 481 (2), 2427-2443. (doi:10.1093/MNRAS/STY2424).

Record type: Article

Abstract

We present calibrations of the redshift distributions of redMaGiC galaxies in the Dark Energy Survey Year 1 (DES Y1) and Sloan Digital Sky Survey (SDSS) DR8 data. These results determine the priors of the redshift distribution of redMaGiC galaxies, which were used for galaxy clustering measurements and as lenses for galaxy-galaxy lensing measurements in DES Y1 cosmological analyses.We empirically determine the bias in redMaGiC photometric redshift estimates using angular cross-correlations with Baryon Oscillation Spectroscopic Survey (BOSS) galaxies. For DES, we calibrate a single-parameter redshift bias in three photometric redshift bins: z ∈ [0.15, 0.3], [0.3,0.45], and [0.45,0.6]. Our best-fit results in each bin give photometric redshift biases of |Δz| < 0.01. To further test the redMaGiC algorithm, we apply our calibration procedure to SDSS redMaGiC galaxies, where the statistical precision of the cross-correlation measurement is much higher due to a greater overlap with BOSS galaxies. For SDSS, we also find best-fit results of |Δz| < 0.01. We compare our results to other analyses of redMaGiC photometric redshifts.

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More information

Accepted/In Press date: 31 August 2018
e-pub ahead of print date: 3 September 2018
Keywords: Galaxies: distances and redshifts, Large-scale structure of Universe, Surveys
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Identifiers

Local EPrints ID: 430441
URI: http://eprints.soton.ac.uk/id/eprint/430441
DOI: doi:10.1093/MNRAS/STY2424
ISSN: 1365-2966
PURE UUID: 2796ecae-76d4-4dcf-a696-5793f1d68725
ORCID for M. Smith: ORCID iD orcid.org/0000-0002-3321-1432

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Date deposited: 01 May 2019 16:30
Last modified: 12 Nov 2024 02:50

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Contributors

Author: R. Cawthon
Author: C. Davis
Author: M. Gatti
Author: P. Vielzeuf
Author: J. Elvin-Poole
Author: E. Rozo
Author: J. Frieman
Author: E. S. Rykoff
Author: A. Alarcon
Author: G. M. Bernstein
Author: C. Bonnett
Author: A. Carnero Rosell
Author: F. J. Castander
Author: C. Chang
Author: L. N. da Costa
Author: J. De Vicente
Author: J. De Rose
Author: A. Drlica-Wagner
Author: E. Gaztanaga
Author: T. Giannantonio
Author: D. Gruen
Author: J. Gschwend
Author: W. G. Hartley
Author: B. Hoyle
Author: H. Lin
Author: M. A.G. Maia
Author: R. Miquel
Author: R. L.C. Ogando
Author: M. M. Rau
Author: A. Roodman
Author: A. J. Ross
Author: I. Sevilla-Noarbe
Author: M. A. Troxel
Author: R. H. Wechsler
Author: T. M.C. Abbott
Author: F. B. Abdalla
Author: S. Allam
Author: J. Annis
Author: S. Avila
Author: M. Banerji
Author: K. Bechtol
Author: R. A. Bernstein
Author: D. Brooks
Author: C. B. D'Andrea
Author: J. L. Marshall
Author: E. Sanchez
Author: M. Smith ORCID iD
Author: R. C. Smith
Author: D. Thomas
Author: A. R. Walker
Corporate Author: DES Collaboration

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