Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aipc..222..421l&link_type=abstract
In: After the first three minutes; Proceedings of the 1st Astrophysics Workshop, Univ. of Maryland, College Park, Oct. 15-17, 19
Astronomy and Astrophysics
Astronomy
1
Cosmology, Dark Matter, Elliptical Galaxies, Spiral Galaxies, Universe, Galactic Mass, Gravitational Effects, Local Group (Astronomy), Mass Distribution
Scientific paper
Deviations from the Hubble flow in the local universe provide a direct measure of the underlying total mass distribution, assuming the gravitational instability picture. A comparison of the mass distribution deduced from the peculiar velocities with the galaxy distribution could tell us the amount of dark matter on large scales. We discuss the origin of motion of the Local Group with respect to the cosmic background radiation and review the peculiar velocity field deduced from distances to hundreds of elliptical and spiral galaxies, including new results for the Shapley supercluster. The density parameter deduced from the relation between the peculiar velocity and acceleration suggests an open universe if light traces mass. However, it is still possible that there is enough matter to close the universe if the galaxy distribution is more strongly clustered ('biased') than the mass distribution.
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