An estimate of Ω_m without priors

Details An estimate of Ω_m without priors An estimate of Ω_m without priors

2003-05-06

arxiv.org/abs/astro-ph/0305078v3

Astrophys.J. 596 (2003) L131-L134

Astronomy and Astrophysics

Astrophysics

12 pages, 4 figures, slight changes to reflect published version

Scientific paper

10.1086/379221

Using mean relative peculiar velocity measurements for pairs of galaxies, we estimate the cosmological density parameter $\Omega_m$ and the amplitude of density fluctuations $\sigma_8$. Our results suggest that our statistic is a robust and reproducible measure of the mean pairwise velocity and thereby the $\Omega_m$ parameter. We get $\Omega_m = 0.30^{+0.17}_{-0.07}$ and $\sigma_8 = 1.13^{+0.22}_{-0.23}$. These estimates do not depend on prior assumptions on the adiabaticity of the initial density fluctuations, the ionization history, or the values of other cosmological parameters.

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