Mathematics – Logic
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...283....1d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 283, Aug. 1, 1984, p. 1-23.
Mathematics
Logic
64
Big Bang Cosmology, Correlation, Galactic Clusters, Spatial Distribution, Astronomical Models, Galactic Evolution, Orthogonality, Perturbation Theory, Shapes
Scientific paper
The authors study the two-point spatial correlation function of galaxies, ξ(r), in a series of numerical simulations of cosmological clustering scenarios in comparison with ξ(r) obtained from redshift samples. The evolution of ξ(r) is evaluated in new large-scale 10000-body simulations of the pancake scenarios. The observed excess of correlation in the range 2 - 10 Mpc h-1, which does not agree with a pure hierarchical clustering scenario, is reproduced in a scenario where λ = 30±5 Mpc h-1 superclusters collapse first to flat (or elongated) pancakes. The shape of ξ(r) is reproduced provided that the first pancaking occurred at z ≤ 0.5 if Ω = 1 and z < 2 if Ω0 = 0.1. This result indicates that galaxy formation preceded supercluster formation. Constraints on the spectrum of density perturbations after decoupling are obtained and the origin of such a spectrum with respect to the particles that dominate the mass of the universe is considered.
Aarseth Sverre J.
Dekel Avishai
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