Determining Omega from Peculiar Velocities
Abstract
The large-scale dynamics of matter is inferred from the observed peculiar velocities of galaxies via the POTENT procedure. The smoothed fields of velocity and mass-density fluctuations are recovered from the current data of about 3000 galaxies. The cosmological density parameter Omega can then be constrained in three ways: (a) by comparing the density fields of mass and galaxies, (b) by using the velocity field in voids, and (c) by investigating quasilinear deviations from Gaussian fluctuations. The results indicate a high value of Omega near unity; values in the range 0.1-0.3 are rejected with high confidence.
Cite
@article{arxiv.astro-ph/9309028,
title = {Determining Omega from Peculiar Velocities},
author = {Avishai Dekel},
journal= {arXiv preprint arXiv:astro-ph/9309028},
year = {2007}
}
Comments
9 pages including 6 figures, compressed and uuencoded PostScript 0.6Mbyte, for Cosmic Velocitiy Fields, IAP Paris July 1993 (preprint: HUJI-AST-002) (Also available by anonymous ftp from alf.huji.ac.il as pub/dekel/reviews/iap93.ps.Z of 0.44Mbyte)