Other
Scientific paper
Jan 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...336...46w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 336, Jan. 1, 1989, p. 46-57.
Other
37
Cosmology, Dark Matter, Galactic Clusters, Galactic Evolution, Elliptical Galaxies, Power Spectra, Spatial Distribution
Scientific paper
The shapes and orientations of rich clusters of galaxies formed in various cosmogonic scenarios are studied by means of high-resolution N-body simulations and compared with observations. The ellipticities of the main bodies of the simulated clusters are found to be fairly independent of the initial conditions and therefore cannot provide a very sensitive test for cosmology. On the other hand, the orientations of clusters with respect to the galaxy distribution on larger scales are found to provide a very useful test. A pronounced tendency for alignment is found in the pancake scenario, on scales up to at least 10/h Mpc, and presumably further. Weaker, although still significant, alignments are also seen in the n = -2 hierarchical case and the hybrid scenario, while no detectable alignments are found for either the n = 0 or n = -1 hierarchical scenarios, which approximates cold dark matter on cluster scales.
Dekel Avishai
Oemler Augustus Jr.
West Michael J.
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