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 - INSPIRE

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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

eBOSS

Collaboration

•

Metin Ata
(
- Potsdam, Astrophys. Inst.
)

May 17, 2017

22 pages

Published in:

Mon.Not.Roy.Astron.Soc. 473 (2018) 4, 4773-4794

Published: Feb 1, 2018

e-Print:

1705.06373 [astro-ph.CO]

DOI:

10.1093/mnras/stx2630

Experiments:

eBOSS

View in:

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Abstract: (Oxford University Press)

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 setallow 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: (z = 1.52) = 3843 ± 147(r_d/r_d, 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 Ω_Λ > 0 at 6.6σ significance when testing a ΛCDM model with free curvature.

Note:

Accepted by MNRAS; BAO distance likelihood available in source files 'QSOv1.9fEZmock_BAOchi2.dat'; full set of data to be public eventually from SDSS website

cosmology: observations
dark energy
distance scale
large-scale structure of Universe

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