Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.251..227l&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 251, July 15, 1991, p. 227-242. Research supported by N
Astronomy and Astrophysics
Astrophysics
18
Angular Momentum, Astronomical Models, Barred Galaxies, Disk Galaxies, Many Body Problem, Momentum Transfer, Globular Clusters, Gravitational Fields, Hamiltonian Functions, Molecular Clouds, Star Distribution
Scientific paper
A model galaxy with an artificial bar is used to explore the angular momentum exchange induced by bar-like (m=2) perturbations to a disc. An analytic formula for this exchange which predicts to within about 1 percent the interaction between a weak bar and a nonself-gravitating disc. The results of N-body experiments are presented, which suggest that the neglect of disc self-gravity in analytic theory leads to: (1) an underestimate of the slowdown rate of a bar which is dominated by corotation and outer Lindblad resonances; (2) an overestimate of the spin-up rate of a bar which is dominated by inner Lindblad resonances. Additional simulations suggest that the importance of disc self-gravity is generally enhanced by increasing the age of the bar, but is lessened by increasing the temperature of the disc. All these effects have naturally explanations, and estimates of their magnitude are provided for several particular cases.
Carlberg Ray G.
Little Blane
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