Skip to Main content Skip to Navigation
Journal articles

Baryon acoustic oscillations at z = 2.34 from the correlations of Lyα absorption in eBOSS DR14

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.
Document type :
Journal articles
Complete list of metadatas

Cited literature [63 references]  Display  Hide  Download

https://hal-cea.archives-ouvertes.fr/cea-02283743
Contributor : Edp Sciences <>
Submitted on : Wednesday, September 11, 2019 - 10:34:55 AM
Last modification on : Monday, May 11, 2020 - 6:08:02 PM
Long-term archiving on: : Friday, February 7, 2020 - 11:06:02 PM

File

aa35638-19.pdf
Publication funded by an institution

Identifiers

Citation

Victoria de Sainte Agathe, Christophe Balland, Hélion Du Mas Des Bourboux, Nicolás G. Busca, Michael Blomqvist, et al.. Baryon acoustic oscillations at z = 2.34 from the correlations of Lyα absorption in eBOSS DR14. Astronomy and Astrophysics - A&A, EDP Sciences, 2019, 629, pp.A85. ⟨10.1051/0004-6361/201935638⟩. ⟨cea-02283743⟩

Share

Metrics

Record views

293

Files downloads

517