Dissipationless collapse in an expanding universe

Journal Article · Fri Feb 01 04:00:00 EST 1991 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/169696· OSTI ID:5867604

Katz, N ^[1]

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1. Princeton Univ. Observatory, NJ (USA)

The collapse of isolated top-hat perturbations with general and cosmologically relevant initial conditions is considered. The simulations are started in Hubble flow with varying amounts of solid body rotation and small-scale power that is added in a controlled manner, with different power-law slopes and amplitudes. Velocities are initialized under the assumption that they were acquired solely through gravitational interaction before the start of the simulation in a manner consistent with the clumpiness of the particle distribution. The resulting collapses are clumpy and resemble merger events. The final density profiles in projection approximately follow a de Vaucouleurs R exp 1/4 law. The radial orbit instability does not appear important in determining the final shape of the systems, which range from oblate to triaxial to prolate. The final equilibria closely resemble elliptical galaxies with projected ellipticities ranging from E1 to E6. 26 refs.

• OSTI ID: 5867604
• Journal Information: Astrophysical Journal; (USA), Journal Name: Astrophysical Journal; (USA) Vol. 368; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CONFIGURATION
COSMOLOGICAL MODELS
DENSITY
ELLIPTICAL CONFIGURATION
EXPANSION
GALACTIC EVOLUTION
GALAXIES
GALAXY CLUSTERS
GRAVITATIONAL COLLAPSE
HUBBLE EFFECT
MANY-BODY PROBLEM
MATHEMATICAL MODELS
MORPHOLOGY
PHYSICAL PROPERTIES