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We study the clustering of galaxies, as a function of their colour, from DataRelease Ten (DR10) of the SDSS-III Baryon Oscillation Spectroscopic Survey. Weselect 122,967 galaxies with 0.43 < z < 0.7 into a "Blue" sample and 131,969into a "Red" sample based on k+e corrected (to z=0.55) r-i colours and i bandmagnitudes. The samples are chosen to each contain more than 100,000 galaxies,have similar redshift distributions, and maximize the difference in clusteringamplitude. The Red sample has a 40% larger bias than the Blue (b_Red/b_Blue =1.39+-0.04), implying the Red galaxies occupy dark matter halos with an averagemass that is 0.5 log Mo greater. Spherically averaged measurements of thecorrelation function, \xi 0, and the power spectrum are used to locate theposition of the baryon acoustic oscillation (BAO) feature of both samples.Using \xi 0, we obtain distance scales, relative to our reference LCDMcosmology, of 1.010+-0.027 for the Red sample and 1.005+-0.031 for the Blue.After applying reconstruction, these measurements improve to 1.013+/-0.020 forthe Red sample and 1.008+-0.026 for the Blue. For each sample, measurements of\xi 0 and the second multipole moment, \xi 2, of the anisotropic correlationfunction are used to determine the rate of structure growth, parameterized byf\sigma 8. We find f\sigma 8,Red = 0.511+-0.083, f\sigma 8,Blue =0.509+/-0.085, and f\sigma 8,Cross = 0.423+-0.061 (from the cross-correlationbetween the Red and Blue samples). We use the covariance between the bias andgrowth measurements obtained from each sample and their cross-correlation toproduce an optimally-combined measurement of f\sigma 8,comb = 0.443+-0.055. Inno instance do we detect significant differences in distance scale or structuregrowth measurements obtained from the Blue and Red samples.

monthly notices of the royal astronomical society

The Clustering of Galaxies in the SDSS-III DR10 Baryon Oscillation  Spectroscopic Survey: No Detectable Colour Dependence of Distance Scale or  Growth Rate Measurements