2020/07/31 by Hélion du Mas des Bourboux, James Rich, Andreu Font-Ribera +36 · 1 citation
Physics and Astronomy · #astro-ph.CO
paper · pdf · doi:10.3847/1538-4357/abb085
published as 2020 ApJ 901 2 153 · 37 pages, 23 figures, Matches the published version by ApJ
arxiv created 2020/10/05 · arxiv updated 2020/10/07
We present a measurement of baryonic acoustic oscillations (BAO) from Lyman-α (Lyα) absorption and quasars at an effective redshift z=2.33 using the complete extended Baryonic Oscillation Spectroscopic Survey (eBOSS). The sixteenth and final eBOSS data release (SDSS DR16) contains all data from eBOSS and its predecessor, the Baryonic Oscillation Spectroscopic Survey (BOSS), providing 210,005 quasars with zq>2.10 that are used to measure Lyα absorption. We measure the BAO scale both in the auto-correlation of Lyα absorption and in its cross correlation with 341,468 quasars with redshift zq>1.77. Apart from the statistical gain from new quasars and deeper observations, the main improvements over previous work come from more accurate modeling of physical and instrumental correlations and the use of new sets of mock data. Combining the BAO measurement from the auto- and cross-correlation yields the constraints of the two ratios DH(z=2.33)/rd = 8.99 ± 0.19 and DM(z=2.33)/rd = 37.5 ± 1.1, where the error bars are statistical. These results are within 1.5σ of the prediction of the flat-ΛCDM cosmology of Planck~(2016). The analysis code, picca, the catalog of the flux-transmission field measurements, and the Δχ2 surfaces are publicly available.