The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: BAO and RSD measurements from anisotropic clustering analysis of the Quasar Sample in configuration space between redshift 0.8 and 2.2

Abstract

We measure the anisotropic clustering of the quasar sample from Data Release 16 (DR16) of the Sloan Digital Sky Survey IV extended Baryon Oscillation Spectroscopic Survey (eBOSS). A sample of $343,708$ spectroscopically confirmed quasars between redshift $0.8<z<2.2$ are used as tracers of the underlying dark matter field. In comparison with DR14 sample, the final sample doubles the number of objects as well as the survey area. In this paper, we present the analysis in configuration space by measuring the two-point correlation function and decompose using the Legendre polynomials. For the full-shape analysis of the Legendre multipole moments, we measure the BAO distance and the growth rate of the cosmic structure. At an effective redshift of $z_{\mathrm{eff}}=1.48$, we measure the comoving angular diameter distance $D_{\mathrm{M}}(z_{\mathrm{eff}})/r_{\mathrm{drag}}=30.66\pm 0.88$, the Hubble distance $D_{\mathrm{H}}(z_{\mathrm{eff}})/r_{\mathrm{drag}}=13.11\pm 0.52$, and the growth rate $f{\sigma }_8(z_{\mathrm{eff}})=0.439\pm 0.048$. The accuracy of these measurements is confirmed using an extensive set of mock simulations developed for the quasar sample. The uncertainties on the distance and growth rate measurements have been reduced substantially ($\sim 45\%$ and $\sim 30\%$) with respect to the DR14 results. We also perform a BAO-only analysis to cross check the robustness of the methodology of the full-shape analysis. Combining our analysis with the Fourier space analysis, we arrive at $D_{\mathrm{M}}^{\mathbf{c}}(z_{\mathrm{eff}})/r_{\mathrm{drag}}=30.22\pm 0.79$, $D_{\mathrm{H}}^{\mathbf{c}}(z_{\mathrm{eff}})/r_{\mathrm{drag}}=13.26\pm 0.47$, and $f{\sigma }_8^{\mathbf{c}}(z_{\mathrm{eff}})=0.464\pm 0.045$.

arXiv comment21 pages, 16 figures, matches version accepted by MNRAS

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