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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

  • Author(s): Ata, M
  • Baumgarten, F
  • Bautista, J
  • Beutler, F
  • Bizyaev, D
  • Blanton, MR
  • Blazek, JA
  • Bolton, AS
  • Brinkmann, J
  • Brownstein, JR
  • Burtin, E
  • Chuang, CH
  • Comparat, J
  • Dawson, KS
  • de la Macorra, A
  • Du, W
  • des Bourboux, HDM
  • Eisenstein, DJ
  • Gil-Marín, H
  • Grabowski, K
  • Guy, J
  • Hand, N
  • Ho, S
  • Hutchinson, TA
  • Ivanov, MM
  • Kitaura, FS
  • Kneib, JP
  • Laurent, P
  • Le Goff, JM
  • McEwen, JE
  • Mueller, EM
  • Myers, AD
  • Newman, JA
  • Palanque-Delabrouille, N
  • Pan, K
  • Pâris, I
  • Pellejero-Ibanez, M
  • Percival, WJ
  • Petitjean, P
  • Prada, F
  • Prakash, A
  • Rodríguez-Torres, SA
  • Ross, AJ
  • Rossi, G
  • Ruggeri, R
  • Sánchez, AG
  • Satpathy, S
  • Schlegel, DJ
  • Schneider, DP
  • Seo, HJ
  • Slosar, A
  • Streblyanska, A
  • Tinker, JL
  • Tojeiro, R
  • Magaña, MV
  • Vivek, M
  • Wang, Y
  • Yèche, C
  • Yu, L
  • Zarrouk, P
  • Zhao, C
  • Zhao, GB
  • Zhu, F
  • et al.
Abstract

© 2015 The Authors. 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 flatΛCDMbest-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 6.6s significance when testing a ΛCDM model with free curvature.

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