Publication Date:
2019-12-31
Description:
We analyse 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 1844 deg2, with an effective volume of 0.9 Gpc3. The analysis was made in configuration space using a Legendre multipole expansion. The Redshift Space Distortion signal is modelled 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(zeff)σ8(zeff)? = 0.454? ±? 0.134, and the Alcock-Paczynski dilation scales which constraints the angular diameter distance $D_A(z_{mathrm{ eff}})=1466.5 pm 133.2 (r_s/r_s^{
m fid})$ and $H(z_{
m eff})=105.8 pm 15.7 (r_s^{
m fid}/r_s) mathrm{km, s^{-1}, Mpc^{-1}}$, where rs is the sound horizon at the end of the baryon drag epoch and $r_s^{
m fid}$ is its value in the fiducial cosmology at an effective redshift zeff? = 0.72. These results are in full agreement with the current Λ-Cold Dark Matter (Λ-CDM) cosmological model inferred from Planck measurements. This study is the first eBOSS LRG full-shape analysis i.e. including Redshift Space Distortions simultaneously with the Alcock-Paczynski effect and the Baryon Acoustic Oscillation scale.
Print ISSN:
0035-8711
Electronic ISSN:
1365-2966
Topics:
Physics
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