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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 Ωm − β 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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