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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 | | 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
; Sebastian E. Nuza
; Ariel G. Sanchez
; Donald P. Schneider
; Ramin A. Skibba
; Flavia Sobreira
; Alina Streblyanska
; Molly E. C. Swanson
; Daniel Thomas
; Jeremy L. Tinker
; David A. Wake
; Idit Zehavi
; Gong-bo Zhao
; | | Date: |
3 Oct 2013 | | Abstract: | We study the clustering of galaxies, as a function of their colour, from Data
Release Ten (DR10) of the SDSS-III Baryon Oscillation Spectroscopic Survey
(BOSS). We select 122,967 galaxies with 0.43 < z < 0.7 into a "Blue" sample and
131,969 into a "Red" sample based on k+e corrected (to z=0.55) r-i colours and
i band magnitudes. The samples are chosen to each contain more than 100,000
galaxies, have similar redshift distributions, and maximize the difference in
clustering amplitude. 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 average mass that is 0.5 log Mo greater. Spherically averaged
measurements of the correlation function, xi 0, and the power spectrum are
used to locate the position of the baryon acoustic oscillation (BAO) feature of
both samples. Using xi 0, we obtain distance scales, relative to our reference
LCDM 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 xi 0 and the second multipole moment, xi 2, of the
anisotropic correlation function are used to determine the rate of structure
growth, parameterized by fsigma 8. We find fsigma 8,Red = 0.511+-0.083,
fsigma 8,Blue = 0.509+/-0.085, and fsigma 8,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 fsigma
8,comb = 0.443+-0.055. In no instance do we detect significant differences in
distance scale or structure growth measurements obtained from the Blue and Red
samples. | | Source: | arXiv, 1310.1106 | | Services: | Forum | Review | PDF | Favorites | |
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