TY - JOUR
T1 - Baryon acoustic oscillations from the cross-correlation of Ly α absorption and quasars in eBOSS DR14
AU - Blomqvist, Michael
AU - Du Mas Des Bourboux, Hélion
AU - Busca, Nicolás G.
AU - De Sainte Agathe, Victoria
AU - Rich, James
AU - Balland, Christophe
AU - Bautista, Julian E.
AU - Dawson, Kyle
AU - Font-Ribera, Andreu
AU - Guy, Julien
AU - Le Goff, Jean Marc
AU - Palanque-Delabrouille, Nathalie
AU - Percival, Will J.
AU - Pérez-Ràfols, Ignasi
AU - Pieri, Matthew M.
AU - Schneider, Donald P.
AU - Slosar, Anže
AU - Yèche, Christophe
N1 - Publisher Copyright:
© M. Blomqvist et al. 2019.
PY - 2019/9/1
Y1 - 2019/9/1
N2 - We present a measurement of the baryon acoustic oscillation (BAO) scale at redshift z = 2.35 from the three-dimensional correlation of Lyman-α (Lyα) forest absorption and quasars. The study uses 266 590 quasars in the redshift range 1.77 < z < 3.5 from the Sloan Digital Sky Survey (SDSS) Data Release 14 (DR14). The sample includes the first two years of observations by the SDSS-IV extended Baryon Oscillation Spectroscopic Survey (eBOSS), providing new quasars and re-observations of BOSS quasars for improved statistical precision. Statistics are further improved by including Lyα absorption occurring in the Lyβ wavelength band of the spectra. From the measured BAO peak position along and across the line of sight, we determined the Hubble distance DH and the comoving angular diameter distance DM relative to the sound horizon at the drag epoch rd: DH(z = 2.35)/rd = 9.20 ± 0.36 and DM(z = 2.35)/rd = 36.3 ± 1.8. These results are consistent at 1.5σ with the prediction of the best-fit spatially-flat cosmological model with the cosmological constant reported for the Planck (2016) analysis of cosmic microwave background anisotropies. Combined with the Lyα auto-correlation measurement presented in a companion paper, the BAO measurements at z = 2.34 are within 1.7σ of the predictions of this model.
AB - We present a measurement of the baryon acoustic oscillation (BAO) scale at redshift z = 2.35 from the three-dimensional correlation of Lyman-α (Lyα) forest absorption and quasars. The study uses 266 590 quasars in the redshift range 1.77 < z < 3.5 from the Sloan Digital Sky Survey (SDSS) Data Release 14 (DR14). The sample includes the first two years of observations by the SDSS-IV extended Baryon Oscillation Spectroscopic Survey (eBOSS), providing new quasars and re-observations of BOSS quasars for improved statistical precision. Statistics are further improved by including Lyα absorption occurring in the Lyβ wavelength band of the spectra. From the measured BAO peak position along and across the line of sight, we determined the Hubble distance DH and the comoving angular diameter distance DM relative to the sound horizon at the drag epoch rd: DH(z = 2.35)/rd = 9.20 ± 0.36 and DM(z = 2.35)/rd = 36.3 ± 1.8. These results are consistent at 1.5σ with the prediction of the best-fit spatially-flat cosmological model with the cosmological constant reported for the Planck (2016) analysis of cosmic microwave background anisotropies. Combined with the Lyα auto-correlation measurement presented in a companion paper, the BAO measurements at z = 2.34 are within 1.7σ of the predictions of this model.
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U2 - 10.1051/0004-6361/201935641
DO - 10.1051/0004-6361/201935641
M3 - Article
AN - SCOPUS:85076146088
SN - 0004-6361
VL - 629
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
M1 - A86
ER -