2020/07/31 by Yuting Wang, Gong‐Bo Zhao, Gong-Bo Zhao +35 · 1 citation
Physics and Astronomy · #Astronomy #Astrophysics #Baryon #COSMIC cancer database #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #Galaxy #Line (geometry) #Oscillation (cell signaling) #Physics #Radio Astronomy Observations and Technology #astro-ph.CO
paper · pdf · doi:10.1093/mnras/staa2593
15 pages, 13 figures, 2 tables; MNRAS accepted; The BAO and RSD measurements and the covariance matrix are made available at https://github.com/ytcosmo/MultiTracerBAORSD/
openalex publication_date 2020/08/24 · arxiv created 2020/09/16 · arxiv updated 2020/09/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
ABSTRACT We perform a multitracer analysis using the complete Sloan Digital Sky Survey IV (SDSS-IV) extended Baryon Oscillation Spectroscopic Survey (eBOSS) DR16 luminous red galaxy (LRG) and the DR16 emission-line galaxy (ELG) samples in the configuration space, and successfully detect a cross-correlation between the two samples, and find the growth rate to be fσ8=0.342 ± 0.085 (∼25 per cent accuracy) from the cross-sample alone. We perform a joint measurement of the baryonic acoustic oscillation (BAO) and redshift space distortion (RSD) parameters at a single effective redshift of zeff = 0.77, using the autocorrelation and cross-correlation functions of the LRG and ELG samples, and find that the comoving angular diameter distance DM(zeff)/rd = 18.85 ± 0.38, the Hubble distance DH(zeff)/rd = 19.64 ± 0.57, and fσ8(zeff) = 0.432 ± 0.038, which is consistent with a ΛCDM model at 68 \rm per cent CL. Compared to the single-tracer analysis on the LRG sample, the Figure of Merit of α⊥, α∥, andfσ8 is improved by a factor of 1.11 in our multitracer analysis, and in particular, the statistical uncertainty of fσ8 is reduced by 11.6 \rm per cent.