Other
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...264..373d&link_type=abstract
Astrophysical Journal, Part 1, vol. 264, Jan. 15, 1983, p. 373-391.
Other
53
Cosmology, Galactic Clusters, Galactic Evolution, Gravitational Collapse, Many Body Problem, Perturbation Theory, Adiabatic Conditions, Big Bang Cosmology
Scientific paper
N-body simulations in an Einstein-de Sitter universe, as well as an approximate model in an open universe, are used to study the formation and dynamical evolution of flat superclusters (SCs) out of adiabatic perturbations of the Zel'dovich type. A nondissipative formation scenario, in which galaxies or other structures form prior to the collapse of SCs from small-scale perturbations, is found to be compatible with the observed flattening of the local supercluster (LSC). In the best fitting model, the LSC has only recently collapsed in one dimension, where 20-50 percent of the galaxies have crossed the plane by the present time and correspond to a caustic at redshifts smaller than 0.5. It is found that the dissipative pancake scenario, in which galaxies form due to the SC collapse, leads to an excessively flat distribution of galaxies.
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