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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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  • Metin Ata
  • Falk Baumgarten
  • Julian Bautista
  • Dmitry Bizyaev
  • Michael R. Blanton
  • Jonathan A. Blazek
  • Adam S. Bolton
  • Jonathan Brinkmann
  • Joel R. Brownstein
  • Etienne Burtin
  • Chia-hsun Chuang
  • Johan Comparat
  • Kyle S. Dawson
  • Axel de la Macorra
  • Wei Du
  • Hélion du Mas des Bourboux
  • Daniel J. Eisenstein
  • Héctor Gil-Marín
  • Katie Grabowski
  • Julien Guy
  • Nick Hand
  • Shirley Ho
  • Timothy A. Hutchinson
  • Mikhail M. Ivanov
  • Francisco-Shu Kitaura
  • Jean-Paul Kneib
  • Pierre Laurent
  • Jean-Marc Le Goff
  • Joseph E. Mcewen
  • Eva-Maria Mueller
  • Adam D. Myers
  • Jeffrey A. Newman
  • Nathalie Palanque-Delabrouille
  • Kaike Pan
  • Isabelle Pâris
  • Marcos Pellejero-Ibanez
  • Will Percival
  • Patrick Petitjean
  • Francisco Prada
  • Abhishek Prakash
  • Sergio A. Rodríguez-Torres
  • Ashley J. Ross
  • Graziano Rossi
  • Rossana Ruggeri
  • Ariel G. Sánchez
  • Siddharth Satpathy
  • David J. Schlegel
  • Donald P. Schneider
  • Hee-Jong Seo
  • Anže Slosar
  • Alina Streblyanska
  • Jeremy L. Tinker
  • Rita Tojeiro
  • Mariana Vargas Magaña
  • M. Vivek
  • Yuting Wang
  • Christophe Yèche
  • Liang Yu
  • Pauline Zarrouk
  • Cheng Zhao
  • Fangzhou Zhu

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Original languageEnglish
Pages (from-to)4773-4794
Number of pages22
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
Early online date11 Oct 2017
Publication statusPublished - 1 Feb 2018


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 data set 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.

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