Dark Energy Survey Year 3 results: A 2.7% measurement of baryon acoustic oscillation distance scale at redshift 0.835
Entity
UAM. Departamento de Física TeóricaPublisher
American Physical SocietyDate
2022-02-08Citation
10.1103/PhysRevD.105.043512
Physical Review D 105.4 (2022): 043512
ISSN
2470-0010 (print); 2470-0029 (online)DOI
10.1103/PhysRevD.105.043512Project
Gobierno de España. ESP2017-89838; Gobierno de España. PGC2018-094773-B-C32; Gobierno de España. PGC2018-102021; Gobierno de España. SEV-2016-0588; Gobierno de España. SEV-2016-0597; Gobierno de España. MDM-2015-0509; info:eu-repo/grantAgreement/EC/FP7/291329/EU//TESTDE; info:eu-repo/grantAgreement/EC/FP7/240672/EU//COGS; info:eu-repo/grantAgreement/EC/FP7/306478/EU//COSMICDAWNEditor's Version
https://doi.org/10.1103/PhysRevD.105.043512Subjects
Galaxies; Halo; Red Shift; FísicaNote
Artículo escrito por un elevado número de autores, solo se referencian el que aparece en primer lugar, el nombre del grupo de colaboración, si le hubiere, y los autores pertenecientes a la UAMRights
© 2022 American Physical SocietyAbstract
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 þ SNIa, they lead to improvements
in H0 and Ωm constraints by ∼20%
Files in this item
Google Scholar:Abbott, T. M. C
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DES Collaboration
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Ávila Pérez, Santiago Javier
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García-Bellido Capdevila, Juan
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