TY - JOUR
T1 - Measurement of baryon acoustic oscillation correlations at z = 2.3 with SDSS DR12 Ly α-Forests
AU - Bautista, Julian E.
AU - Busca, Nicolás G.
AU - Guy, Julien
AU - Rich, James
AU - Blomqvist, Michael
AU - Du Mas Des Bourboux, Hélion
AU - Pieri, Matthew M.
AU - Font-Ribera, Andreu
AU - Bailey, Stephen
AU - Delubac, Timothée
AU - Kirkby, David
AU - Le Goff, Jean Marc
AU - Margala, Daniel
AU - Slosar, AnžE
AU - Vazquez, Jose Alberto
AU - Brownstein, Joel R.
AU - Dawson, Kyle S.
AU - Eisenstein, Daniel J.
AU - Miralda-Escudé, Jordi
AU - Noterdaeme, Pasquier
AU - Palanque-Delabrouille, Nathalie
AU - Pâris, Isabelle
AU - Petitjean, Patrick
AU - Ross, Nicholas P.
AU - Schneider, Donald P.
AU - Weinberg, David H.
AU - Yèche, Christophe
PY - 2017/7/1
Y1 - 2017/7/1
N2 - We have used flux-transmission correlations in Lyα forests to measure the imprint of baryon acoustic oscillations (BAO). The study uses spectra of 157 783 quasars in the redshift range 2:1 ≤ z ≤ 3:5 from the Sloan Digital Sky Survey (SDSS) data release 12 (DR12). Besides the statistical improvements on our previous studies using SDSS DR9 and DR11, we have implemented numerous improvements in the analysis procedure, allowing us to construct a physical model of the correlation function and to investigate potential systematic errors in the determination of the BAO peak position. The Hubble distance, DH = c=H(z), relative to the sound horizon is DH(z = 2:33)=rd = 9:07 ± 0:31. The best-determined combination of comoving angular-diameter distance, DM, and the Hubble distance is found to be D0:7 H D0:3 M =rd = 13:94±0:35. This value is 1:028±0:026 times the prediction of the flat-ΛCDM model consistent with the cosmic microwave background (CMB) anisotropy spectrum. The errors include marginalization over the effects of unidentified high-density absorption systems and fluctuations in ultraviolet ionizing radiation. Independently of the CMB measurements, the combination of our results and other BAO observations determine the open-ΛCDM density parameters to be ΩM = 0:296 ± 0:029, ΩΛ = 0:699 ± 0:100 and Ωk = -0:002 ± 0:119.
AB - We have used flux-transmission correlations in Lyα forests to measure the imprint of baryon acoustic oscillations (BAO). The study uses spectra of 157 783 quasars in the redshift range 2:1 ≤ z ≤ 3:5 from the Sloan Digital Sky Survey (SDSS) data release 12 (DR12). Besides the statistical improvements on our previous studies using SDSS DR9 and DR11, we have implemented numerous improvements in the analysis procedure, allowing us to construct a physical model of the correlation function and to investigate potential systematic errors in the determination of the BAO peak position. The Hubble distance, DH = c=H(z), relative to the sound horizon is DH(z = 2:33)=rd = 9:07 ± 0:31. The best-determined combination of comoving angular-diameter distance, DM, and the Hubble distance is found to be D0:7 H D0:3 M =rd = 13:94±0:35. This value is 1:028±0:026 times the prediction of the flat-ΛCDM model consistent with the cosmic microwave background (CMB) anisotropy spectrum. The errors include marginalization over the effects of unidentified high-density absorption systems and fluctuations in ultraviolet ionizing radiation. Independently of the CMB measurements, the combination of our results and other BAO observations determine the open-ΛCDM density parameters to be ΩM = 0:296 ± 0:029, ΩΛ = 0:699 ± 0:100 and Ωk = -0:002 ± 0:119.
KW - Cosmological parameters
KW - Dark energy
KW - RCUK
KW - STFC
UR - http://www.scopus.com/inward/record.url?scp=85021764718&partnerID=8YFLogxK
UR - http://discovery.ucl.ac.uk/1550072/
U2 - 10.1051/0004-6361/201730533
DO - 10.1051/0004-6361/201730533
M3 - Article
AN - SCOPUS:85021764718
SN - 0004-6361
VL - 603
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
M1 - A12
ER -