The completed SDSS-IV extended baryon oscillation spectroscopic survey: Baryon acoustic oscillations with lyα forests

Hélion du Mas des Bourboux, James Rich, Andreu Font-Ribera, Victoria de Sainte Agathe, James Farr, Thomas Etourneau, Jean Marc Le Goff, Andrei Cuceu, Christophe Balland, Julian E. Bautista, Michael Blomqvist, Jonathan Brinkmann, Joel R. Brownstein, Solène Chabanier, Edmond Chaussidon, Kyle Dawson, Alma X. González-Morales, Julien Guy, Brad W. Lyke, Axel de la MacorraEva Maria Mueller, Adam D. Myers, Christian Nitschelm, Andrea Muñoz Gutiérrez, Nathalie Palanque-Delabrouille, James Parker, Will J. Percival, Ignasi Pérez-Ràfols, Patrick Petitjean, Matthew M. Pieri, Corentin Ravoux, Graziano Rossi, Donald P. Schneider, Hee Jong Seo, Anže Slosar, Julianna Stermer, M. Vivek, Christophe Yèche, Samantha Youles

Research output: Contribution to journalArticlepeer-review

181 Scopus citations


We present a measurement of baryonic acoustic oscillations (BAOs) from Lyα absorption and quasars at an effective redshift z = 2.33 using the complete extended Baryonic Oscillation Spectroscopic Survey (eBOSS). The 16th 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 autocorrelation 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.

Original languageEnglish (US)
Article number153
JournalAstrophysical Journal
Issue number2
StatePublished - Oct 1 2020

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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