Constraints on Omega from the IRAS redshift surveys
Dec, 1994
13 pages
Published in:
- Mon.Not.Roy.Astron.Soc. 275 (1995) 515
e-Print:
- astro-ph/9412062 [astro-ph]
Report number:
- IASSNS-AST-94-63
View in:
Citations per year
Abstract: (arXiv)
We measure the anisotropy of the redshift-space power spectrum in the 1.2-Jy and QDOT redshift surveys of IRAS-selected galaxies. On large scales, this anisotropy is caused by coherent peculiar motions, and gravitational instability theory predicts a distortion of the power spectrum that depends only on the ratio , where Omega is the cosmological density parameter and is the bias parameter. On small scales, the distortion is dominated by the random velocity dispersion in non-linear structures. We fit the observed anisotropy with an analytic model that incorporates two parameters, beta, and a small-scale velocity dispersion sigma_v. Tests on N-body simulations show that this model recovers beta quite accurately on the scales accessible to the existing IRAS redshift surveys. Applying our procedure to the 1.2-Jy and QDOT surveys, we find beta=0.52 +/- 0.13 and beta=0.54 +/- 0.3, respectively. These results imply Omega approximately 0.35 if galaxies trace mass, or a bias factor of about 2 if Omega=1.References(58)
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