TY - JOUR
T1 - Baryon acoustic oscillations at z = 2.34 from the correlations of Ly α absorption in eBOSS DR14
AU - De Sainte Agathe, Victoria
AU - Balland, Christophe
AU - Du Mas Des Bourboux, Hélion
AU - Busca, Nicolás G.
AU - Blomqvist, Michael
AU - Guy, Julien
AU - Rich, James
AU - Font-Ribera, Andreu
AU - Pieri, Matthew M.
AU - Bautista, Julian E.
AU - Dawson, Kyle
AU - Le Goff, Jean Marc
AU - De La Macorra, Axel
AU - Palanque-Delabrouille, Nathalie
AU - Percival, Will J.
AU - Pérez-Ràfols, Ignasi
AU - Schneider, Donald P.
AU - Slosar, Anže
AU - Yèche, Christophe
N1 - Publisher Copyright:
© V. de Sainte Agathe et al. 2019.
PY - 2019/9/1
Y1 - 2019/9/1
N2 - 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.
AB - 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.
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U2 - 10.1051/0004-6361/201935638
DO - 10.1051/0004-6361/201935638
M3 - Article
AN - SCOPUS:85075290575
SN - 0004-6361
VL - 629
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
M1 - A85
ER -