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    Dark Energy Survey Year 3 results: A 2.7% measurement of baryon acoustic oscillation distance scale at redshift 0.835

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    PhysRevD.105.043512.pdf
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    Author
    DES Collaboration
    Affiliation
    Department of Astronomy/Steward Observatory, University of Arizona
    Issue Date
    2022
    
    Metadata
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    Publisher
    American Physical Society
    Citation
    Abbott, T. M. C., Aguena, M., Allam, S., Amon, A., Andrade-Oliveira, F., Asorey, J., Avila, S., Bernstein, G. M., Bertin, E., Brandao-Souza, A., Brooks, D., Burke, D. L., Calcino, J., Camacho, H., Carnero Rosell, A., Carollo, D., Carrasco Kind, M., Carretero, J., Castander, F. J., … Wilkinson, R. D. (2022). Dark Energy Survey Year 3 results: A 2.7% measurement of baryon acoustic oscillation distance scale at redshift 0.835. Physical Review D.
    Journal
    Physical Review D
    Rights
    Copyright © 2022 American Physical Society.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    We present angular diameter measurements obtained by measuring the position of baryon acoustic oscillations (BAO) in an optimized sample of galaxies from the first three years of Dark Energy Survey data (DES Y3). The sample consists of 7 million galaxies distributed over a footprint of 4100 deg2 with 0.6<zphoto<1.1 and a typical redshift uncertainty of 0.03(1+z). The sample selection is the same as in the BAO measurement with the first year of DES data, but the analysis presented here uses three times the area, extends to higher redshift, and makes a number of improvements, including a fully analytical BAO template, the use of covariances from both theory and simulations, and an extensive preunblinding protocol. We used two different statistics; angular correlation function and power spectrum, and validate our pipeline with an ensemble of over 1500 realistic simulations. Both statistics yield compatible results. We combine the likelihoods derived from angular correlations and spherical harmonics to constrain the ratio of comoving angular diameter distance DM at the effective redshift of our sample to the sound horizon scale at the drag epoch. We obtain DM(zeff=0.835)/rd=18.92±0.51, which is consistent with, but smaller than, the Planck prediction assuming flat ΛCDM, at the level of 2.3σ. The analysis was performed blind and is robust to changes in a number of analysis choices. It represents the most precise BAO distance measurement from imaging data to date, and is competitive with the latest transverse ones from spectroscopic samples at z>0.75. When combined with DES 3x2pt+SNIa, they lead to improvements in H0 and ωm constraints by ∼20%. © 2022 American Physical Society.
    Note
    Immediate access
    ISSN
    2470-0010
    DOI
    10.1103/PhysRevD.105.043512
    Version
    Final published version
    ae974a485f413a2113503eed53cd6c53
    10.1103/PhysRevD.105.043512
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    UA Faculty Publications

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