Mathematics – Logic
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..379...68r&link_type=abstract
Cosmic Frontiers ASP Conference Series, Vol. 379, proceedings of the conference held 31 July-4 August 2006 at Durham University,
Mathematics
Logic
1
Scientific paper
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 bar{z}=0.55. We find a simple power-law of the form ξ(r)=(r/r_{0})^{-γ} fits the data well, with a correlation length of r_{0}=7.45^{+0.35}_{-0.30} h^{-1}{Mpc} 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 Ω_{m} and β where β = Ω_{m}^{0.6} / b and b is the linear bias factor. Using this Alcock-Paczynski style geometric test, we find a degeneracy in the Ω_{m}-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 Ω_{m}(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.
Cruz da Ângela J.
Ross Nicholas P.
Shanks Tom
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