Dynamics of superclusters - Reconciling Omega(0) = 1.0 with observations?

Details Dynamics of superclusters - Reconciling Omega(0) = 1.0 with observations? Dynamics of superclusters - Reconciling Omega(0) = 1.0 with observations?

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...340...69h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 340, May 1, 1989, p. 69-76.

Statistics

Computation

12

Astronomical Models, Celestial Mechanics, Cosmology, Galactic Clusters, Computational Astrophysics, Dark Matter, Galactic Evolution, Local Group (Astronomy)

Scientific paper

The dynamics of superclusters is investigated within the Zel'dovich quasi-linear approximation. The density and infall velocity field of a supercluster are calculated to quasi-linear order and then are used as input parameters to the standard model to yield an apparent value of Omega. An ensemble of superclusters seeded by the local maxima of a Gaussian delta field is constructed to yield a distribution of Omega(app) values. The resulting value of Omega(app) of a given supercluster depends on its stage of dynamical evolution and the magnitude of the shear component. Application of these calculations to the Local Supercluster shows that, where the density is measured in reshift space, an observed value of Omega of about 0.2 is consistent with an actual Omega(0) = 1.0.

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