The completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: BAO and RSD measurements from the anisotropic power spectrum of the quasar sample between redshift 0.8 and 2.2. Issue 1 (12th September 2020)

• Record Type: Journal Article
• Authors: Neveux, Richard; Burtin, Etienne; de Mattia, Arnaud; Smith, Alex; Ross, Ashley J; Hou, Jiamin; Bautista, Julian; Brinkmann, Jonathan; Chuang, Chia-Hsun; Dawson, Kyle S; Gil-Marín, Héctor; W. Lyke, Brad; de la Macorra, Axel; du Mas des Bourboux, Hélion; Mohammad, Faizan G; Müller, Eva-Maria; Myers, Adam D; Newman, Jeffrey A; Percival, Will J; Rossi, Graziano; Schneider, Donald; Vivek, M; Zarrouk, Pauline; Zhao, Cheng; Zhao, Gong-Bo
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 499:Issue 1(2020)
• Page Start: 210
• Page End: 229
• Publication Date: 2020-09-12
• Subjects: galaxies: distances and redshifts -- dark energy -- distance scale -- large-scale structure of Universe -- cosmology: observations; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/staa2780
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: We measure the clustering of quasars of the final data release (DR16) of eBOSS. The sample contains $343\, 708$ quasars between redshifts 0.8 ≤ z ≤ 2.2 over $4699\, \mathrm{deg}^2$ . We calculate the Legendre multipoles (0, 2, 4) of the anisotropic power spectrum and perform a BAO and a Full-Shape (FS) analysis at the effective redshift z eff = 1.480. The errors include systematic errors that amount to 1/3 of the statistical error. The systematic errors comprise a modelling part studied using a blind N -body mock challenge and observational effects studied with approximate mocks to account for various types of redshift smearing and fibre collisions. For the BAO analysis, we measure the transverse comoving distance D M ( z eff )/ r drag = 30.60 ± 0.90 and the Hubble distance D H ( z eff )/ r drag = 13.34 ± 0.60. This agrees with the configuration space analysis, and the consensus yields: D M ( z eff )/ r drag = 30.69 ± 0.80 and D H ( z eff )/ r drag = 13.26 ± 0.55. In the FS analysis, we fit the power spectrum using a model based on Regularised Perturbation Theory, which includes redshift space distortions and the Alcock–Paczynski effect. The results are D M ( z eff )/ r drag = 30.68 ± 0.90 and D H ( z eff )/ r drag = 13.52 ± 0.51 and we constrain the linear growth rate of structure f ( z eff )σ8 ( z eff ) = 0.476 ± 0.047. Our results agree with the configuration space analysis. The consensus analysis of the eBOSS quasar sample yields: D M ( z eff )/ r drag = 30.21 ± 0.79, D H ( z eff )/ r drag = 3.23 ± 0.47, and f ( z eff )σ8 ( z eff ) = 0.462 ± 0.045 and is consistent with a flat ΛCDM cosmological model using Planck results.