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The clustering of galaxies in the SDSS-III DR10 Baryon Oscillation Spectroscopic Survey: no detectable colour dependence of distance scale or growth rate measurements

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Author(s)

Ashley J. Ross, Lado Samushia, Angela Burden, Will J. Percival, Rita Tojeiro, Marc Manera, Florian Beutler, J. Brinkmann, Joel R. Brownstein, Aurelio Carnero, Luiz A. N. da Costa, Daniel J. Eisenstein, Hong Guo, Shirley Ho, Marcio A. G. Maia, Francesco Montesano, Demitri Muna, Robert C. Nichol, Sebastián E. Nuza, Ariel G. Sánchez & 10 more Donald P. Schneider, Ramin A. Skibba, Flávia Sobreira, Alina Streblyanska, Molly E. C. Swanson, Daniel Thomas, Jeremy L. Tinker, David A. Wake, Idit Zehavi, Gong-bo Zhao

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Abstract

We study the clustering of galaxies, as a function of their colour, from Data Release Ten (DR10) of the Sloan Digital Sky Survey III (SDSS-III) Baryon Oscillation Spectroscopic Survey. DR10 contains 540 505 galaxies with 0.43 < z < 0.7; from these we select 122 967 for a ‘Blue’ sample and 131 969 for a ‘Red’ sample based on k + e corrected (to z = 0.55) r − i colours and i-band magnitudes. The samples are chosen such that both contain more than 100 000 galaxies, have similar redshift distributions and maximize the difference in clustering amplitude. The Red sample has a 40 per cent larger bias than the Blue (bRed/bBlue = 1.39 ± 0.04), implying that the Red galaxies occupy dark matter haloes with an average mass that is 0.5 log10 M⊙ greater. Spherically averaged measurements of the correlation function, ξ0, and the power spectrum are used to locate the position of the baryon acoustic oscillation (BAO) feature of both samples. Using ξ0, we obtain distance scales, relative to the distance of our reference Λ cold dark matter cosmology, 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 for the Red sample and 1.008 ± 0.026 for the Blue. For each sample, measurements of ξ0 and the second multipole moment, ξ2, of the anisotropic correlation function are used to determine the rate of structure growth, parametrized by fσ8. We find fσ8, Red = 0.511 ± 0.083, fσ8, Blue = 0.509 ± 0.085 and fσ8, Cross = 0.423 ± 0.061 (from the cross-correlation between the Red and Blue samples). We use the covariance between the bias and growth measurements obtained from each sample and their cross-correlation to produce an optimally combined measurement of fσ8, comb = 0.443 ± 0.055. This result compares favourably to that of the full 0.43 < z < 0.7 sample (fσ8, full = 0.422 ± 0.051) despite the fact that, in total, we use less than half of the number of galaxies analysed in the full sample measurement. In no instance do we detect significant differences in distance scale or structure growth measurements obtained from the Blue and Red samples. Our results are consistent with theoretical predictions and our tests on mock samples, which predict that any colour-dependent systematic uncertainty on the measured BAO position is less than 0.5 per cent.
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Original languageEnglish
Pages (from-to)1109-1126
Number of pages18
JournalMonthly Notices of the Royal Astronomical Society
Volume437
Early online date19 Nov 2013
DOIs
Publication statusPublished - 11 Jan 2014

    Research areas

  • Cosmology: observations, Distance scale, Large-scale structure of Universe

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