Statistics – Computation
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...376..371v&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 376, Aug. 1, 1991, p. 371-379.
Statistics
Computation
5
Dark Matter, Galactic Evolution, Computational Astrophysics, Cosmology, Halos
Scientific paper
The formation of galactic halos in a flat universe dominated by massive neutrinos is studied. The linear growth of a perturbation, seeded by a stationary point mass born at some arbitrary early time in the early universe, is calculated fully relativistically. The nonlinear evolution of the perturbation is calculated using a dissipationless three-dimensional N-body code. The halos generated are well approximated by isothermal spheres, generating flat rotation curves, in agreement with galactic rotational velocity observations. With a massive object dominating the central region, the core radius becomes an ill-defined quantity; if a large fraction of the inner region made up of some other material, such as baryons, it is possible to produce small galaxies with low velocity dispersions. With a system largely dominated by neutrinos, the simulations indicate the Tremaine-Gunn limit is overly conservative. In the case studied, the core radius was 50 percent larger and the central density about 3 times smaller than that given by the Tremaine and Gunn (1979) calculation.
van Dalen Anthony
Villumsen Jens V.
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