de Sainte Agathe, V;
Balland, C;
des Bourboux, HDM;
Busca, NG;
Blomqvist, M;
Guy, J;
Rich, J;
... Yeche, C; + view all
(2019)
Baryon acoustic oscillations at z=2.34 from the correlations of Ly alpha absorption in eBOSS DR14.
Astronomy & Astrophysics
, 629
, Article A 85. 10.1051/0004-6361/201935638.
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Abstract
We measure the imprint of primordial baryon acoustic oscillations (BAOs) in the correlation function of Lyα absorption in quasar spectra from the Baryon Oscillation Spectroscopic Survey (BOSS) and the extended BOSS (eBOSS) in Data Release 14 (DR14) of the Sloan Digital Sky Survey (SDSS)-IV. In addition to 179 965 spectra with absorption in the Lyman-α (Lyα) region, we use Lyα absorption in the Lyman-β region of 56 154 spectra for the first time. We measure the Hubble distance, DH, and the comoving angular diameter distance, DM, relative to the sound horizon at the drag epoch rd at an effective redshift z = 2.34. Using a physical model of the correlation function outside the BAO peak, we find DH(2.34)/rd = 8.86 ± 0.29 and DM(2.34)/rd = 37.41 ± 1.86, within 1σ from the flat-ΛCDM model consistent with CMB anisotropy measurements. With the addition of polynomial “broadband” terms, the results remain within one standard deviation of the CMB-inspired model. Combined with the quasar-Lyα cross-correlation measurement presented in a companion paper, the BAO measurements at z = 2.35 are within 1.7σ of the predictions of this model.
| Type: | Article |
|---|---|
| Title: | Baryon acoustic oscillations at z=2.34 from the correlations of Ly alpha absorption in eBOSS DR14 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1051/0004-6361/201935638 |
| Publisher version: | https://doi.org/10.1051/0004-6361/201935638 |
| Language: | English |
| Additional information: | © V. de Sainte Agathe et al. 2019. Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
| Keywords: | cosmology: observations, cosmological parameters, dark energy |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10082019 |
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