Alignments of clusters of galaxies as a probe for superclusters

Details Alignments of clusters of galaxies as a probe for superclusters Alignments of clusters of galaxies as a probe for superclusters

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...279....1d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 279, April 1, 1984, p. 1-12.

Mathematics

Logic

50

Astronomical Models, Cosmology, Galactic Clusters, Galactic Structure, Alignment, Computerized Simulation, Percolation, Spatial Distribution, Statistical Tests

Scientific paper

N-body simulations of competing cosmological scenarios are used to study the relative orientations of the principal axes of clusters of galaxies and the lines connecting them to neighboring clusters and to find that they provide a sensitive test for the formation of the large-scale structure in the universe. The observed tendency of clusters to point toward each other reflects the existence of 20-50 Mpc/h elongated superclusters that construct a large-scale cell structure. Tidal interactions between clusters are found not to produce similar alignments, presumably because the clusters are surrounded by underdense regions. Hence the scenario in which superclusters have collapsed from excessive fluctuations on large scales is favored over hierarchical clustering from fluctuations on smaller scales. Rich clusters (but not necessarily galaxies) had to be formed after, or during, the aspherical collapse of superclusters, i.e., not long before z of about 1. Other tests are applied to the simulated samples: the axial ratios of clusters on various scales are found to be sensitive to the elongation of superclusters, while the maximum percolation length is less sensitive to it here.

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