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Title:
Angular momentum growth in protogalaxies
Authors:
White, S. D. M.
Affiliation:
AA(California, University, Santa Barbara, CA; Steward Observatory, Tucson, AZ)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 286, Nov. 1, 1984, p. 38-41. NASA-supported research. (ApJ Homepage)
Publication Date:
11/1984
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Angular Momentum, Computational Astrophysics, Galactic Evolution, Gravitation Theory, Many Body Problem, Perturbation Theory
DOI:
10.1086/162573
Bibliographic Code:
1984ApJ...286...38W

Abstract

An analysis by Doroshkevich (1970) which shows that the angular momentum of galaxies grew to first order (in proportion to t) during the linear phases of protogalactic evolution is expanded. This result is confirmed in N-body simulations of the formation of structure. The well-known study of Peebles (1969) found growth at second order only (in proportion to t to the 5/3-power) because its analysis was restricted to spherical regions. In such regions growth occurs purely as a result of convective effects on the bounding surface; the material initially within a spherical volume gains no angular momentum in second-order perturbation theory. These considerations do not affect estimates of the total angular momentum acquired by a galaxy in the gravitational instability picture.

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