2014/04/30 by Yun Wang · 2 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics #Baryon #Correlation function (quantum field theory) #Cosmic variance #Cosmology #Cosmology and Gravitation Theories #Dark energy #Galaxies: Formation, Evolution, Phenomena #Galaxy #Matter power spectrum #Physics #Redshift #Spectral density #Statistics #astro-ph.CO
paper · pdf · doi:10.1093/mnras/stu1374
published as MNRAS, 443, 2950 (2014) · 8 pages, 4 figures. Slightly modified version, accepted by MNRAS
arxiv created 2014/07/07 · openalex publication_date 2014/08/06 · arxiv updated 2015/06/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We analyse the anisotropic two-dimensional galaxy correlation function (2DCF) of the CMASS galaxy samples from the Sloan Digital Sky Survey Data Release 9 of the Baryon Oscillation Spectroscopic Survey data. Modelling the 2DCF fully including non-linear effects and redshift space distortions (RSD) in the scale range of 30–120 h−1 Mpc, we find H(0.57)rs(zd)/c = 0.0444 ± 0.0019, DA(0.57)/rs(zd) = 9.01 ± 0.23, and fg(0.57)σ8(0.57) = 0.474 ± 0.075, where rs(zd) is the sound horizon at the drag epoch computed using a simple integral, fg(z) is the growth rate at redshift z, and σ8(z) represents the matter power spectrum normalization on 8 h−1 Mpc scale at z. We find that the scales larger than 120 h−1 Mpc are dominated by noise in the 2DCF analysis, and that the inclusion of scales 30–40 h−1 Mpc significantly tightens the RSD measurement. Our measurements are consistent with previous results using the same data, but have significantly better precision since we are using all the information from the 2DCF in the scale range of 30–120 h−1 Mpc. Our measurements have been marginalized over sufficiently wide priors for the relevant parameters; they can be combined with other data to probe dark energy and gravity.