Statistics – Computation
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...382..466s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 382, Dec. 1, 1991, p. 466-474. Research supported by University of Wisconsi
Statistics
Computation
30
Dark Matter, Elliptical Galaxies, Galactic Structure, Halos, Astronomical Models, Computational Astrophysics, Luminosity
Scientific paper
N-body simulations are described to investigate whether the presence of dark matter in elliptical galaxies could inhibit the bar-making instability which is characteristic of systems with many stars on near-radial orbits. The calculations show that neither a fixed static halo nor a halo composed of particles with isotropic velocity dispersions is very effective in suppressing the instability; thus the presence of a dark halo is not likely to affect conclusions about how anisotropic the velocities of stars in elliptical galaxies might be. Modifications of the Jeans-type stability criterion of Polyachenko and Shukman to include the effect of the halo are in agreement with the results for a halo of 'live' particles but overestimate the stabilizing effect of a fixed halo potential. Evidence that the bar-making instability can change the radial density profile of the models, significantly reducing an initial high central concentration, is presented.
Sparke Linda S.
Stiavelli Massimo
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