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We analyze the anisotropic two dimensional galaxy correlation function (2DCF)of the CMASS galaxy sample from the Sloan Digital Sky Survey Data Release 9(DR9) of the Baryon Oscillation Spectroscopic Survey (BOSS) data. Modeling the2DCF fully including nonlinear effects and redshift space distortions (RSD) inthe scale range of 30 to 120 h^{-1}Mpc, we find H(0.57)r_s(z_d)/c=0.0444 +/-0.0019, D_A(0.57)/r_s(z_d)=9.01 +/- 0.23, and f_g(0.57)\sigma_8(0.57)=0.474 +/-0.075, where r_s(z_d) is the sound horizon at the drag epoch computed using asimple integral, and f_g(z) is the growth rate at redshift z, and \sigma_8(z)represents the matter power spectrum normalization on 8h^{-1}Mpc scale at z. Wefind that the scales larger than 120 h^{-1}Mpc are dominated by noise in the2DCF analysis, and that the inclusion of scales 30-40 h^{-1}Mpc significantlytightens the RSD measurement. Our measurements are consistent with previousresults using the same data, but have significantly better precision since weare using all the information from the 2DCF in the scale range of 30 to 120h^{-1}Mpc. Our measurements have been marginalized over sufficiently widepriors for the relevant parameters; they can be combined with other data toprobe dark energy and gravity.

monthly notices of the royal astronomical society

Model-Independent Measurements of Cosmic Expansion and Growth at z=0.57  Using the Anisotropic Clustering of CMASS Galaxies From the Sloan Digital Sky  Survey Data Release 9