The completed SDSSIV 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 twopoint correlation function and decomposing it using the Legendre polynomials. For the fullshape analysis of the Legendre multipole moments, we measure the baryon acoustic oscillation (BAO) distance and the growth rate of the cosmic structure. At an effective redshift of z_{eff} = 1.48, we measure the comoving angular diameter distance D_{M}(z_{eff})/r_{drag} = 30.66 ± 0.88, the Hubble distance D_{H}(z_{eff})/r_{drag} = 13.11 ± 0.52, and the product of the linear growth rate and the rms linear mass fluctuation on scales of $8 \, h^{1}\, {\rm Mpc}$ , fσ_{8}(z_{eff}) = 0.439 ± 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 (∼45 and ∼30 per cent) with respect to the DR14 results. We also perform a BAOonly analysis to cross check the robustness of the methodology of the fullshape analysis. Combining our analysis with the Fourierspace analysis, we arrive at $D^{{\bf c}}_{\rm M}(z_{\rm eff})/r_{\rm drag} = 30.21 \pm 0.79$ , $D^{{\bf c}}_{\rm H}(z_{\rm eff})/r_{\rm drag} = 13.23 \pm 0.47$ , and $f\sigma _8^{{\bf c}}(z_{\rm eff}) = 0.462 \pm 0.045$ .
 Publication:

Monthly Notices of the Royal Astronomical Society
 Pub Date:
 January 2021
 DOI:
 10.1093/mnras/staa3234
 arXiv:
 arXiv:2007.08998
 Bibcode:
 2021MNRAS.500.1201H
 Keywords:

 methods: data analysis;
 quasars: general;
 cosmology: observations;
 cosmology: largescale structure of Universe;
 cosmology: dark energy;
 cosmology: distance scale;
 Astrophysics  Cosmology and Nongalactic Astrophysics
 EPrint:
 21 pages, 16 figures, matches version accepted by MNRAS