Large-Scale Anisotropic Correlation Function of SDSS Luminous Red Galaxies

Details Large-Scale Anisotropic Correlation Function of SDSS Luminous Red Galaxies Large-Scale Anisotropic Correlation Function of SDSS Luminous Red Galaxies

2007-11-22

arxiv.org/abs/0711.3640v2

Astrophys.J.676:889-898,2008

Astronomy and Astrophysics

Astrophysics

11 pages, 9 figures, 1 table, typo corrected, references added with respect to published version

Scientific paper

10.1086/528951

We study the large-scale anisotropic two-point correlation function using 46,760 luminous red galaxies at redshifts 0.16 -- 0.47 from the Sloan Digital Sky Survey. We measure the correlation function as a function of separations parallel and perpendicular to the line-of-sight in order to take account of anisotropy of the large-scale structure in redshift space. We find a slight signal of baryonic features in the anisotropic correlation function, i.e., a ``baryon ridge'' which corresponds to a baryon acoustic peak in the spherically averaged correlation function which has already been reported using the same sample. The baryon ridge has primarily a spherical structure with a known radius in comoving coordinates. It enables us to divide the redshift distortion effects into dynamical and geometrical components and provides further constraints on cosmological parameters, including the dark energy equation-of-state. With an assumption of a flat $\Lambda$ cosmology, we find the best-fit values of $\Omega_{\rm m} = 0.218^{+0.047}_{-0.037}$ and $\Omega_{\rm b} = 0.047^{+0.016}_{-0.016}$ (68% C.L.) when we use the overall shape of the anisotropic correlation function of $40

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