Properties of galactic halos in spatially flat universes dominated by cold dark matter - Effects of nonvanishing cosmological constant

Details Properties of galactic halos in spatially flat universes dominated by cold dark matter - Effects of nonvanishing cosmological constant Properties of galactic halos in spatially flat universes dominated by cold dark matter - Effects of nonvanishing cosmological constant

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...396..395s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 396, no. 2, Sept. 10, 1992, p. 395-410. Research supported by MOESC.

Statistics

Computation

18

Cosmology, Dark Matter, Galactic Halos, Galaxies, Many Body Problem, Space-Time Functions, Computational Astrophysics, Einstein Equations, Galactic Rotation, Intergalactic Media, Luminosity, Universe

Scientific paper

Properties of galactic halos in the cold dark matter (CDM) dominated universes are studied using cosmological N-body simulations. Assuming that the universe is spatially flat, two specific examples in CDM cosmogonies are considered; one is the Einstein-de Sitter model, and the other is given a low mean mass density and nonvanishing cosmological constant, lambda. It is found that flat rotation curve of halos extending about 100/h kpc is reproduced only with the fixed-linking friends-of-friends algorithm for the CDM models in the Einstein-de Sitter universe. Thus such a shape of the rotation curve may not be a universal feature intrinsic to the models. Models with nonzero lambda, on the other hand, show nearly flat rotation curves up to about (50-100)/h kpc. In addition, this conclusion is relatively insensitive to the halo identification algorithm in contrast to the case with the Einstein-de Sitter models. Therefore nonzero lambda CDM models most successfully account for the observed flat rotation curve of galaxies.

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