Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....68..345p&link_type=abstract
Astronomy and Astrophysics, vol. 68, no. 3, Aug. 1978, p. 345-352. NSF-supported research.
Astronomy and Astrophysics
Astrophysics
16
Astronomical Models, Galactic Clusters, Many Body Problem, Spatial Distribution, Clumps, Cosmology, Statistical Correlation
Scientific paper
N-body experiments are discussed which demonstrate that a clustering hierarchy in the galaxy distribution can be remarkably stable. Initial positions and velocities are set up according to a simple clustering model, the particle motions are numerically integrated, and the evolution is measured by the two- and three-point correlation functions for two cases, one with 256 identical particles per clump and the other with a mean of 25.6 identical particles per clump. In both cases it is found that the correlation functions change very little over some 40 crossing times for the smallest scale of clustering and exhibit no appreciable evolution in a Hubble time and through a range of cluster sizes of at least about a factor of 30. This behavior is shown to be contrary to what would be expected if the hierarchy were fusing into monolithic clusters.
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