Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.255..729q&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 255, April 15, 1992, p. 729-736.
Astronomy and Astrophysics
Astronomy
71
Angular Momentum, Galactic Evolution, Galactic Mass, Galactic Rotation, Tides, Autocorrelation, Center Of Mass, Dark Matter, Spherical Shells
Scientific paper
The generation of galactic angular momentum by tidal forces is re-examined. The tidal torques in linear theory on a spherical shell centered either on a random point or on a peak in the smoothed density field are calculated. It is shown that when the torque is decomposed into contributions from multipoles, the dipole term is more important than the quadrupole, and higher multipoles are unimportant. When the dipole contribution is taken into account, the torques of thin shells of radii r and r prime are anticorrelated for r/r prime equal to or greater than 2. Significant contributions to the torque on any shell come from shells that are more than five times as big. The magnitude of the torque on a shell does not depend greatly on whether the shell is centered on a peak in the smoothed density field rather than on a random point.
Binney James
Quinn Thomas
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