We present a one per cent measurement of the cosmic distance scale from the detections of the baryon acoustic oscillations in the clustering of galaxies from the Baryon Oscillation Spectroscopic Survey ( BOSS ) , which is part of the Sloan Digital Sky Survey III ( SDSS-III ) .
Our results come from the Data Release 11 ( DR11 ) sample , containing nearly one million galaxies and covering approximately 8 500 square degrees and the redshift range 0.2 < z < 0.7 .
We also compare these results with those from the publicly released DR9 and DR10 samples .
Assuming a concordance \Lambda CDM cosmological model , the DR11 sample covers a volume of 13 Gpc ^ { 3 } and is the largest region of the Universe ever surveyed at this density .
We measure the correlation function and power spectrum , including density-field reconstruction of the baryon acoustic oscillation ( BAO ) feature .
The acoustic features are detected at a significance of over 7 \sigma in both the correlation function and power spectrum .
Fitting for the position of the acoustic features measures the distance relative to the sound horizon at the drag epoch , r _ { d } , which has a value of r _ { d, { fid } } = 149.28 Mpc in our fiducial cosmology .
We find D _ { V } = ( 1264 \pm 25 { Mpc } ) ( r _ { d } / r _ { d, { fid } } ) at z = 0.32 and D _ { V } = ( 2056 \pm 20 { Mpc } ) ( r _ { d } / r _ { d, { fid } } ) at z = 0.57 .
At 1.0 per cent , this latter measure is the most precise distance constraint ever obtained from a galaxy survey .
Separating the clustering along and transverse to the line-of-sight yields measurements at z = 0.57 of D _ { A } = ( 1421 \pm 20 { Mpc } ) ( r _ { d } / r _ { d, { fid } } ) and H = ( 96.8 \pm 3.4 { km / s / Mpc } ) ( r _ { d, { fid } } / r _ { d } ) .
Our measurements of the distance scale are in good agreement with previous BAO measurements and with the predictions from cosmic microwave background data for a spatially flat cold dark matter model with a cosmological constant .