The clustering of the SDSS-IV extended Baryon Oscillation Spectroscopic Survey DR14 LRG sample: structure growth rate measurement from the anisotropic LRG correlation function in the redshift range 0.6 < z < 1.0

Abstract

We analyze the anisotropic clustering of the Sloan Digital Sky Survey-IV Extended Baryon Oscillation Spectroscopic Survey (eBOSS) Luminous Red Galaxy Data Release 14 (DR14) sample combined with Baryon Oscillation Spectroscopic Survey (BOSS) CMASS sample of galaxies in the redshift range 0.6$<z<$1.0, which consists of 80,118 galaxies from eBOSS and 46,439 galaxies from the BOSS-CMASS sample. The eBOSS-CMASS Luminous Red Galaxy sample has a sky coverage of 1,844 deg${}^2$, with an effective volume of 0.9 Gpc${}^3$. The analysis was made in configuration space using a Legendre multipole expansion. The Redshift Space Distortion signal is modeled as a combination of the Convolution Lagrangian Perturbation Model and the Gaussian Streaming Model. We constrain the logarithmic growth of structure times the amplitude of dark matter density fluctuations, $f(z_{\mathrm{eff}})\ddot{I}{ƒ}_8(z_{\mathrm{eff}})=0.454\pm 0.139$, and the Alcock-Paczynski dilation scales which constraints the angular diameter distance $D_A(z_{eff})=1466.5\pm 136.6(r_s/r_s^{\mathrm{fid}})$ and $H(z_{\mathrm{eff}})=105.8\pm 16(r_s^{\mathrm{fid}}/r_s)\mathrm{km}{\mathrm{s}}^{-1}\mathrm{Mp}{\mathrm{c}}^{-1}$, where $r_s$ is the sound horizon at the end of the baryon drag epoch and $r_s^{\mathrm{fid}}$ is its value in the fiducial cosmology at an effective redshift $z_{\mathrm{eff}}=0.72$. These results are in full agreement with the current $\hat{I}›$-Cold Dark Matter ($\hat{I}›$-CDM) cosmological model inferred from Planck measurements. This study is the first eBOSS LRG full-shape analysis i.e. including Redshift-Space Distortions (RSD) simultaneously with the Alcock-Paczynski (AP) effect and the Baryon Acoustic Oscillation (BAO) scale.

Accepted on the 5th December 2019, 28 pages,27 figures