%0 Journal Article %T The one-dimensional Ly-alpha forest power spectrum from BOSS %A Nathalie Palanque-Delabrouille %A Christophe Y¨¨che %A Arnaud Borde %A Jean-Marc Le Goff %A Graziano Rossi %A Matteo Viel %A ¨¦ric Aubourg %A Stephen Bailey %A Julian Bautista %A Michael Blomqvist %A Adam Bolton %A James S. Bolton %A Nicol¨¢s G. Busca %A Bill Carithers %A Rupert A. C. Croft %A Kyle S. Dawson %A Timoth¨¦e Delubac %A Andreu Font-Ribera %A Shirley Ho %A David Kirkby %A Khee-Gan Lee %A Daniel Margala %A Jordi Miralda-Escud¨¦ %A Demitri Muna %A Adam D. Myers %A Pasquier Noterdaeme %A Isabelle Paris %A Patrick Petitjean %A Matthew M. Pieri %A James Rich %A Emmanuel Rollinde %A Nicholas P. Ross %A David J. Schlegel %A Donald P. Schneider %A An£¿e Slosar %A David H. Weinberg %J Physics %D 2013 %I arXiv %R 10.1051/0004-6361/201322130 %X We have developed two independent methods to measure the one-dimensional power spectrum of the transmitted flux in the Lyman-$\alpha$ forest. The first method is based on a Fourier transform, and the second on a maximum likelihood estimator. The two methods are independent and have different systematic uncertainties. The determination of the noise level in the data spectra was subject to a novel treatment, because of its significant impact on the derived power spectrum. We applied the two methods to 13,821 quasar spectra from SDSS-III/BOSS DR9 selected from a larger sample of over 60,000 spectra on the basis of their high quality, large signal-to-noise ratio, and good spectral resolution. The power spectra measured using either approach are in good agreement over all twelve redshift bins from $ = 2.2$ to $ = 4.4$, and scales from 0.001 $\rm(km/s)^{-1}$ to $0.02 \rm(km/s)^{-1}$. We determine the methodological and instrumental systematic uncertainties of our measurements. We provide a preliminary cosmological interpretation of our measurements using available hydrodynamical simulations. The improvement in precision over previously published results from SDSS is a factor 2--3 for constraints on relevant cosmological parameters. For a $\Lambda$CDM model and using a constraint on $H_0$ that encompasses measurements based on the local distance ladder and on CMB anisotropies, we infer $\sigma_8 =0.83\pm0.03$ and $n_s= 0.97\pm0.02$ based on \ion{H}{i} absorption in the range $2.1