Acquisition of angular momentum by tidal torques in expanding, spherical-symmetric density perturbations - an analysis of different approximations. II

Details Acquisition of angular momentum by tidal torques in expanding, spherical-symmetric density perturbations - an analysis of different approximations. II Acquisition of angular momentum by tidal torques in expanding, spherical-symmetric density perturbations - an analysis of different approximations. II

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...239....7c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 239, no. 1-2, Nov. 1990, p. 7-23. Research supported by CNR.

Statistics

Computation

5

Angular Momentum, Approximation, Computational Astrophysics, Density Distribution, Galactic Evolution, Torque, Mathematical Models, Perturbation Theory, Universe

Scientific paper

This paper analyzes different approximations of the evolution of expanding spherical-symmetric density perturbations which gain angular momentum by tidal torques. The evolution of expanding spherical-symmetric density perturbations is improved and extended, with regard to both initial configuration and evolution, mainly in the context of an Einstein-de Sitter universe. Qualitative estimates are made of the angular momentum and of the spin parameter for different masses and peak heights. It is shown that, to obtain close agreement with a median value of spin parameter of about 0.05 found by several authors, an underestimate by a factor of at least 4 of the rate of acquisition of angular momentum has to be assumed.

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