Skip to content

The clustering of the SDSS-IV extended Baryon Oscillation Spectroscopic Survey DR14 quasar sample: a tomographic measurement of cosmic structure growth and expansion rate based on optimal redshift weights

Research output: Contribution to journalArticle

  • Gong Bo Zhao
  • Yuting Wang
  • Shun Saito
  • Héctor Gil-Marín
  • Will J. Percival
  • Dandan Wang
  • Chia Hsun Chuang
  • Rossana Ruggeri
  • Eva Maria Mueller
  • Fangzhou Zhu
  • Rita Tojeiro
  • Isabelle Pâris
  • Adam D. Myers
  • Jeremy L. Tinker
  • Jian Li
  • Etienne Burtin
  • Pauline Zarrouk
  • Florian Beutler
  • Falk Baumgarten
  • Joel R. Brownstein
  • Kyle S. Dawson
  • Jiamin Hou
  • Axel De La Macorra
  • Graziano Rossi
  • John A. Peacock
  • Ariel G. Sánchez
  • Arman Shafieloo
  • Donald P. Schneider
  • Cheng Zhao

We develop a new method, which is based on the optimal redshift weighting scheme, to extract the maximal tomographic information of baryonic acoustic oscillations (BAO) and redshift space distortions (RSD) from the extended Baryon Oscillation Spectroscopic Survey (eBOSS) Data Release 14 quasar (DR14Q) survey. We validate our method using the Extended Zel'dovich mocks, and apply our pipeline to the eBOSS DR14Q sample in the redshift range of 0.8 < z < 2.2. We report a joint measurement of fσ8 and two-dimensional BAO parameters DA and H at four effective redshifts of zeff = 0.98, 1.23, 1.52, and 1.94, and provide the full data covariance matrix. Using our measurement combined with BOSS DR12, Main Galaxy Sample (MGS), and 6 degree Field Galaxy Survey (6dFGS) BAO measurements, we find that the existence of dark energy is supported by observations at a 7.4σ significance level. Combining our measurement with BOSS DR12 and Planck observations, we constrain the gravitational growth index to be γ = 0.580 ± 0.082, which is fully consistent with the prediction of general relativity. This paper is part of a set that analyses the eBOSS DR14 quasar sample.

Original languageEnglish
Pages (from-to)3497-3513
Number of pages17
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
Early online date26 Oct 2018
Publication statusPublished - 1 Jan 2019


  • sty2845

    Rights statement: This article has been accepted for publication in MNRAS © 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    Final published version, 2.21 MB, PDF document

Relations Get citation (various referencing formats)

ID: 15860696