Velocity dipoles in cold dark matter cosmologies

Details Velocity dipoles in cold dark matter cosmologies Velocity dipoles in cold dark matter cosmologies

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...386....1t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 386, Feb. 10, 1992, p. 1-8. Research supported by MURST.

Statistics

Computation

10

Dark Matter, Galactic Evolution, Local Group (Astronomy), Velocity Distribution, Astronomical Models, Computational Astrophysics, Elliptical Galaxies, Spiral Galaxies

Scientific paper

Galaxy velocity dipoles are calculated in the frame of a cold dark matter scenario for galaxy formation, allowing the primordial spectral index n and the density parameter Omega0 to take values smaller than the standard ones n = 1, Omega = 1. Different values for the bias parameter b are also considered. Constraints on n, Omega0, and b are obtained by applying a maximum likelihood test to velocity dipoles deduced from a sample of elliptical galaxies, a sample of spiral galaxies, and the motion of the Local Group. The observed galaxy bulk flows favor a flat, or nearly flat, model with a low value for the spectral index and a modest amount of bias.

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