Blomqvist, M;
des Bourboux, HDM;
Busca, NG;
de Sainte Agathe, V;
Rich, J;
Balland, C;
Bautista, JE;
... Yeche, C; + view all
(2019)
Baryon acoustic oscillations from the cross-correlation of Ly alpha absorption and quasars in eBOSS DR14.
Astronomy & Astrophysics
, 629
, Article A 86. 10.1051/0004-6361/201935641.
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Abstract
We present a measurement of the baryon acoustic oscillation (BAO) scale at redshift z = 2.35 from the three-dimensional correlation of Lyman-α (Lyα) forest absorption and quasars. The study uses 266 590 quasars in the redshift range 1.77 < z < 3.5 from the Sloan Digital Sky Survey (SDSS) Data Release 14 (DR14). The sample includes the first two years of observations by the SDSS-IV extended Baryon Oscillation Spectroscopic Survey (eBOSS), providing new quasars and re-observations of BOSS quasars for improved statistical precision. Statistics are further improved by including Lyα absorption occurring in the Lyβ wavelength band of the spectra. From the measured BAO peak position along and across the line of sight, we determined the Hubble distance DH and the comoving angular diameter distance DM relative to the sound horizon at the drag epoch rd: DH(z = 2.35)/rd = 9.20 ± 0.36 and DM(z = 2.35)/rd = 36.3 ± 1.8. These results are consistent at 1.5σ with the prediction of the best-fit spatially-flat cosmological model with the cosmological constant reported for the Planck (2016) analysis of cosmic microwave background anisotropies. Combined with the Lyα auto-correlation measurement presented in a companion paper, the BAO measurements at z = 2.34 are within 1.7σ of the predictions of this model.
| Type: | Article |
|---|---|
| Title: | Baryon acoustic oscillations from the cross-correlation of Ly alpha absorption and quasars in eBOSS DR14 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1051/0004-6361/201935641 |
| Publisher version: | https://doi.org/10.1051/0004-6361/201935641 |
| Language: | English |
| Additional information: | © M. Blomqvist 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: | large-scale structure of Universe , dark energy, cosmological parameters, cosmology: observations , quasars: absorption lines |
| 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.ucl.ac.uk/id/eprint/10082020 |
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