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We present an anisotropic analysis of Baryon Acoustic Oscillation (BAO)signal from the SDSS-IV extended Baryon Oscillation Spectroscopic Survey(eBOSS) Data Release 14 (DR14) quasar sample. The sample consists of 147,000quasars distributed over a redshift range of $0.8 < z < 2.2$. We apply theredshift weights technique to the clustering of quasars in this sample andachieve a 4.6 per cent measurement of the angular distance measurement $D_M$ at$z = 2.2$ and Hubble parameter $H$ at $z=0.8$. We parameterize thedistance-redshift relation, relative to a fiducial model, as a quadraticexpansion. The coefficients of this expansion are used to reconstruct thedistance-redshift relation and obtain distance and Hubble parametermeasurements at all redshifts within the redshift range of the sample.Reporting the result at two characteristic redshifts, we determine $D_M(z=1) =3405\pm305 \ (r_{\rm d} / r_{\rm d, fid}) \ {\rm Mpc}$, $H(z=1) = 120.7\pm 7.3\ (r_{\rm d,fid} / r_{\rm d}) \ {\rm km} \ {\rm s}^{-1}{\rm Mpc}^{-1}$ and$D_M(z=2) = 5325\pm249 \ (r_{\rm d} / r_{\rm d, fid}) \ {\rm Mpc}$, $H(z=2) =189.9\pm 32.9 \ (r_{\rm d,fid} / r_{\rm d}) \ {\rm km} \ {\rm s}^{-1}{\rmMpc}^{-1}$. These measurements are highly correlated. We assess the outlook ofBAO analysis from the final quasar sample by testing the method on a set ofmocks that mimic the noise level in the final sample. We demonstrate on thesemocks that redshift weighting shrinks the measurement error by over 25 per centon average. We conclude redshift weighting can bring us closer to thecosmological goal of the final quasar sample.

monthly notices of the royal astronomical society

The clustering of the SDSS-IV extended Baryon Oscillation Spectroscopic  Survey DR14 quasar sample: Measuring the anisotropic Baryon Acoustic  Oscillations with redshift weights