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The formation of dark halos in a universe dominated by cold dark matter
Frenk, Carlos S.; White, Simon D. M.; Davis, Marc; Efstathiou, George
AA(Durham, University, England), AB(Steward Observatory, Tucson, AZ), AC(California, University, Berkeley), AD(Cambridge University, England)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 327, April 15, 1988, p. 507-525. Research supported by the Nuffield Foundation and SERC. (ApJ Homepage)
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NASA/STI Keywords:
Cosmology, Dark Matter, Galactic Evolution, Galactic Structure, Spiral Galaxies, Stellar Luminosity, Astronomical Models, Computational Astrophysics, Galactic Clusters, Morphology, Universe
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The formation of galactic halos in a flat universe dominated by cold dark matter is investigated. Halos of galactic scale form in abundance only after z of about 3. Most present-day halos had at least two progenitors of similar size at z not less than 1. The typical rotation speed of halos at the present day is only about 10 percent of their rms velocity dispersion. Dark halos are generically triaxial with, perhaps, a slight preference for near-prolate configurations. It is concluded that, if it is correct, the standard idea that galaxies form by condensation of gas with dark halos may actually require a high-density universe in order to be compatible with observation.

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