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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

Research output: Contribution to journalArticle

Author(s)

Metin Ata, Falk Baumgarten, Julian Bautista, Florian Beutler, 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, Helion du Mas des Bourboux, Daniel J. Eisenstein, Hector Gil-Marin, Katie Grabowski & 43 more 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 Paris, Marcos Pellejero-Ibanez, Will J. Percival, Patrick Petitjean, Francisco Prada, Abhishek Prakash, Sergio A. Rodriguez-Torres, Ashley J. Ross, Graziano Rossi, Rossana Ruggeri, Ariel G. Sanchez, Siddharth Satpathy, David J. Schlegel, Donald P. Schneider, Hee-Jong Seo, Anze Slosar, Alina Streblyanska, Jeremy L. Tinker, Rita Tojeiro, Mariana Vargas Magana, M. Vivek, Yuting Wang, Christophe Yeche, Liang Yu, Pauline Zarrouk, Cheng Zhao, Gong-Bo Zhao, Fangzhou Zhu

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Abstract

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.
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Original languageEnglish
Pages (from-to)4773-4794
JournalMonthly Notices of the Royal Astronomical Society
Volume473
Issue number4
Early online date11 Oct 2017
DOIs
Publication statusPublished - Feb 2018

    Research areas

  • Cosmology: observations, Dark energy, Distance scale, Large-scale structure of the Universe

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