An Estimate of Ω M without Conventional Priors

Abstract

Using mean relative peculiar velocity measurements for pairs of galaxies, we estimate the cosmological density parameter Ω m and the amplitude of density fluctuations σ 8. Our results suggest that our statistic is a robust and reproducible measure of the mean pairwise velocity and thereby the Ω m parameter. We get Ω m = 0.30 +0.17 −0.07 and σ 8 = 1.13 +0.22… (More)

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