Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...264l..31s&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 264, Jan. 15, 1983, p. L31-L35.
Astronomy and Astrophysics
Astrophysics
22
Cosmology, Galactic Clusters, Gas Flow, Velocity Distribution, Virgo Galactic Cluster, Baryons, Fourier Transformation, Kinematic Equations, Space Density
Scientific paper
The linear growth rate of small transverse perturbations in a self-gravitating, collisionless gas that is undergoing a one-dimensional collapse is strongly influenced by the nonlinear flow of the background. In the collapse plane, smaller Hubble flow deviations and infall velocities are obtained than in the simple linear theory. Application of this theory to the kinematics of galaxies in a flat supercluster shows that the usual linear approximation may seriously underestimate Omega, the density parameter of the universe, if there is a strong deviation from spherical symmetry. Furthermore, dissipative separation of baryonic matter from collisionless dark material (such as hypothesized massive neutrinos) enhances this effect, leading to apparent Omega values of 0.2-0.3 for a wide range of separation parameters in an Einstein-de Sitter (Omega = 1) model.
Silk Joseph
Szalay Alex S.
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