Galaxy clustering and the origin of large-scale flows

Details Galaxy clustering and the origin of large-scale flows Galaxy clustering and the origin of large-scale flows

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...346l..49j&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 346, Nov. 15, 1989, p. L49-L51. Research supported by NASA and Ne

Statistics

Computation

9

Cosmology, Galactic Clusters, Gravitational Effects, Universe, Computational Astrophysics, Elliptical Galaxies, Perturbation Theory, Spatial Distribution, Spiral Galaxies, Velocity Distribution

Scientific paper

Peebles's 'cosmic virial theorem' is extended from its original range of validity at small separations, where hydrostatic equilibrium holds, to large separations, in which linear gravitational stability theory applies. The rms pairwise velocity difference at separation r is shown to depend on the spatial galaxy correlation function xi(x) only for x less than r. Gravitational instability theory can therefore be tested by comparing the two up to the maximum separation for which both can reliably be determined, and there is no dependence on the poorly known large-scale density and velocity fields. With the expected improvement in the data over the next few years, however, this method should yield a reliable determination of omega.

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