Mathematics – Logic
Scientific paper
Nov 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...250..561d&link_type=abstract
Astrophysical Journal, Part 1, vol. 250, Nov. 15, 1981, p. 567-572.
Mathematics
Logic
20
Computerized Simulation, Galactic Evolution, Halos, Mass Distribution, Astronomical Models, Cosmology, Mathematical Models
Scientific paper
The cosmological evolution of a flat bound density perturbation around a central galaxy is studied by means of N-body simulations with 250-500 bodies forming a slightly bound, homogeneous perturbation around a central massive core. The expansion and infall are followed for several sets of initial conditions, and it is found that the final profile is similar to the maximum expansion profile in most cases. The expected maximum expansions are recalculated, and the possible differences between the N-body results and those obtained in spherical shell simulations are discussed. Finally, the possible role of both secondary infall and tidal interactions in generating the characteristic profiles of galactic halos is considered, and theoretical predictions are compared with observations by Rubin et al. (1980).
Dekel Avishai
Kowitt Mark
Shaham Jacob
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