The Completed SDSS-IV Extended Baryon Oscillation Spectroscopic Survey: Baryon Acoustic Oscillations with Lyα Forests - Archive ouverte HAL Access content directly
Journal Articles Astrophys.J. Year : 2020

The Completed SDSS-IV Extended Baryon Oscillation Spectroscopic Survey: Baryon Acoustic Oscillations with Lyα Forests

Helion Du Mas Des Bourboux
  • Function : Author
Andreu Font-Ribera
  • Function : Author
James Farr
  • Function : Author
Andrei Cuceu
  • Function : Author
Julian E. Bautista
Michael Blomqvist
  • Function : Author
Jonathan Brinkmann
  • Function : Author
Joel R. Brownstein
  • Function : Author
Edmond Chaussidon
  • Function : Author
Kyle Dawson
  • Function : Author
Alma X. Gonzalez-Morales
  • Function : Author
Julien Guy
  • Function : Author
Brad W. Lyke
  • Function : Author
Axel de la Macorra
  • Function : Author
Eva-Maria Mueller
  • Function : Author
Adam D. Myers
  • Function : Author
Christian Nitschelm
  • Function : Author
Andrea Munoz Gutierrez
  • Function : Author
James Parker
  • Function : Author
Will J. Percival
  • Function : Author
Graziano Rossi
  • Function : Author
Donald P. Schneider
  • Function : Author
Hee-Jong Seo
  • Function : Author
Anze Slosar
  • Function : Author
M. Vivek
  • Function : Author
Samantha Youles
  • Function : Author

Abstract

We present a measurement of baryonic acoustic oscillations (BAOs) from Lyα absorption and quasars at an effective redshift 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 z q  > 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 z q  > 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 and , 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 Δχ 2 surfaces are publicly available.

Dates and versions

hal-02927703 , version 1 (01-09-2020)

Identifiers

Cite

Helion Du Mas Des Bourboux, James Rich, Andreu Font-Ribera, Victoria de Sainte Agathe, James Farr, et al.. The Completed SDSS-IV Extended Baryon Oscillation Spectroscopic Survey: Baryon Acoustic Oscillations with Lyα Forests. Astrophys.J., 2020, 901 (2), pp.153. ⟨10.3847/1538-4357/abb085⟩. ⟨hal-02927703⟩
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