Streaming velocities as a dynamical estimator of Omega

Details Streaming velocities as a dynamical estimator of Omega Streaming velocities as a dynamical estimator of Omega

1998-12-28

arxiv.org/abs/astro-ph/9812456v2

Astrophys.J. 515 (1999) L1-L4

Astronomy and Astrophysics

Astrophysics

8 pages of text, 4 figures Subject headings: Cosmology: theory - observation - peculiar velocities: large scale flows Last nam

Scientific paper

10.1086/311959

It is well known that estimating the pairwise velocity of galaxies, v_{12}, from the redshift space galaxy correlation function is difficult because this method is highly sensitive to the assumed model of the pairwise velocity dispersion. Here we propose an alternative method to estimate v_{12} directly from peculiar velocity samples, which contain redshift-independent distances as well as galaxy redshifts. In contrast to other dynamical measures which determine beta = sigma_8 x Omega^{0.6}, our method can provide an estimate of (sigma_8)^2 x Omega^{0.6} for a range of sigma_8 (here Omega is the cosmological mass density parameter while sigma_8 is the standard normalization parameter for the spectrum of matter density fluctuations). We demonstrate how to measure this quantity from realistic catalogues.

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