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Paper: The 2dF-SDSS LRG and QSO (2SLAQ) Survey: LRG Clustering and Redshift-Space Distortions
Volume: 379, Cosmic Frontiers
Page: 68
Authors: Ross, N.P.; Shanks, T.; Cruz da Angela, J.; the 2SLAQ Collaboration
Abstract: We present a clustering analysis of nearly 9 000 Luminous Red Galaxies (LRGs) using the 2dF-SDSS LRG And QSO (2SLAQ) Survey. The mean redshift of our sample is z = 0.55. We find a simple power-law of the form ξ(r) = (r/r0)−γ fits the data well, with a correlation length of r0 = 7.45+0.35−0.30 h−1Mpc and a power-law slope of γ = 1.73 0.06. We then model the redshift-space distortions present in the clustering signal in order to find the value of the cosmological parameters m and β where β = Ω0.6m /b and b is the linear bias factor. Using this Alcock-Paczynski style geometric test, we find a degeneracy in the Ωmβ plane. However, this degeneracy is broken with the addition of extra information in the form of linear clustering evolution constraints. Using this joint method we find Ωm(z = 0) = 0.30 0.15, β(z = 0.55) = 0.45 0.05 and b = 1.66 showing z ~ 0.5 LRGs to be highly clustered objects.
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