The clustering of the SDSS-IV extended Baryon Oscillation Spectroscopic Survey DR14 quasar sample : first measurement of Baryon Acoustic Oscillations between redshift 0.8 and 2.2
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We present measurements of the Baryon Acoustic Oscillation (BAO) scale in redshift-space using the clustering of quasars. We consider a sample of 147 000 quasars from the extended Baryon Oscillation Spectroscopic Survey (eBOSS) distributed over 2044 square degrees with redshifts 0.8 < z < 2.2 and measure their spherically-averaged clustering in both configuration and Fourier space. Our observational data set and the 1400 simulated realizations of the dataset allow us to detect a preference for BAO that is greater than 2.8σ. We determine the spherically averaged BAO distance to z = 1.52 to 3.8 per cent precision:DV(z=1.52)=3843±147(rd/rd,fid) Mpc. This is the first time the location of the BAO feature has been measured between redshifts 1 and 2. Our result is fully consistent with the prediction obtained by extrapolating the Planck flat ΛCDM best-fitting cosmology. All of our results are consistent with basic large-scale structure (LSS) theory, confirming quasars to be a reliable tracer of LSS, and provide a starting point for numerous cosmological tests to be performed with eBOSS quasar samples. We combine our result with previous, independent, BAO distance measurements to construct an updated BAO distance-ladder. Using these BAO data alone and marginalizing over the length of the standard ruler, we find ΩΛ > 0 at 6.6σ significance when testing a ΛCDM model with free curvature.
Ata , M , Baumgarten , F , Bautista , J , Beutler , F , Bizyaev , D , Blanton , M R , Blazek , J A , Bolton , A S , Brinkmann , J , Brownstein , J R , Burtin , E , Chuang , C-H , Comparat , J , Dawson , K S , de la Macorra , A , Du , W , du Mas des Bourboux , H , Eisenstein , D J , Gil-Marin , H , Grabowski , K , Guy , J , Hand , N , Ho , S , Hutchinson , T A , Ivanov , M M , Kitaura , F-S , Kneib , J-P , Laurent , P , Le Goff , J-M , McEwen , J E , Mueller , E-M , Myers , A D , Newman , J A , Palanque-Delabrouille , N , Pan , K , Paris , I , Pellejero-Ibanez , M , Percival , W J , Petitjean , P , Prada , F , Prakash , A , Rodriguez-Torres , S A , Ross , A J , Rossi , G , Ruggeri , R , Sanchez , A G , Satpathy , S , Schlegel , D J , Schneider , D P , Seo , H-J , Slosar , A , Streblyanska , A , Tinker , J L , Tojeiro , R , Vargas Magana , M , Vivek , M , Wang , Y , Yeche , C , Yu , L , Zarrouk , P , Zhao , C , Zhao , G-B & Zhu , F 2018 , ' The clustering of the SDSS-IV extended Baryon Oscillation Spectroscopic Survey DR14 quasar sample : first measurement of Baryon Acoustic Oscillations between redshift 0.8 and 2.2 ' , Monthly Notices of the Royal Astronomical Society , vol. 473 , no. 4 , pp. 4773-4794 . https://doi.org/10.1093/mnras/stx2630
Monthly Notices of the Royal Astronomical Society
Copyright © 2017, the Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1093/mnras/stx2630
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