# Quasar-Lyman α Forest Cross-Correlation from BOSS DR11 : Baryon Acoustic Oscillations

2 APC - Cosmologie
APC (UMR_7164) - AstroParticule et Cosmologie
Abstract : We measure the large-scale cross-correlation of quasars with the Lyman alpha forest absorption, using over 164,000 quasars from Data Release 11 of the SDSS-III Baryon Oscillation Spectroscopic Survey. We extend the previous study of roughly 60,000 quasars from Data Release 9 to larger separations, allowing a measurement of the Baryonic Acoustic Oscillation (BAO) scale along the line of sight $c/(H(z=2.36) ~ r_s) = 9.0 \pm 0.3$ and across the line of sight $D_A(z=2.36)~ / ~ r_s = 10.8 \pm 0.4$, consistent with CMB and other BAO data. Using the best fit value of the sound horizon from Planck data ($r_s=147.49 Mpc$), we can translate these results to a measurement of the Hubble parameter of $H(z=2.36) = 226 \pm 8 km/s$ and of the angular diameter distance of $D_A(z=2.36) = 1590 \pm 60 Mpc$. The measured cross-correlation function and an update of the code to fit the BAO scale (baofit) are made publicly available.
Document type :
Journal articles
Domain :

http://hal.in2p3.fr/in2p3-00903656
Contributor : Eric Aubourg <>
Submitted on : Tuesday, November 12, 2013 - 4:37:54 PM
Last modification on : Saturday, September 19, 2020 - 4:49:52 AM

### Citation

Andreu Font-Ribera, David Kirkby, N.G. Busca, Jordi Miralda-Escudé, Nicholas P. Ross, et al.. Quasar-Lyman α Forest Cross-Correlation from BOSS DR11 : Baryon Acoustic Oscillations. Journal of Cosmology and Astroparticle Physics, Institute of Physics (IOP), 2014, 05, pp.027. ⟨10.1088/1475-7516/2014/05/027⟩. ⟨in2p3-00903656⟩

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