Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...329l...5d&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 329, June 1, 1988, p. L5-L9.
Astronomy and Astrophysics
Astrophysics
14
Astronomical Models, Dark Matter, Galactic Evolution, Mass Distribution, Baryons, Galactic Clusters, Many Body Problem, Monte Carlo Method
Scientific paper
A major difficulty with hot dark matter models, namely their extremely large clustering scales, can be alleviated if small-scale clustering is produced by accretion around a perturbing mass that is not itself composed of dark matter. This paper reports a numerical simulation of such a perturbing mass immersed in a background of hot dark matter. It is found that such accretion can produce a system similar to observed galactic halos with a power law density function proportional to r exp -beta, where beta = 2.05 + or - 0.05. This is a closer fit to the behavior of actual dark halos than any available cold dark matter model produces. If the initial perturbation has mass of roughly five billion solar, the circular velocity for stable orbits is roughly 250 km/s at 5-10 kpc radius and remains almost constant to a halo radius of roughly 320 kpc, which is a reasonable fit for a large isolated spiral galaxy.
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