Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.187..101l&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 187, Apr. 1979, p. 101-107.
Astronomy and Astrophysics
Astronomy
151
Galactic Structure, Orbit Calculation, Stellar Motions, Angular Momentum, Spiral Galaxies, Torque
Scientific paper
By considering the interaction of a single stellar orbit with a weak cos 2 phi potential it is shown that in the central regions of galaxies with slowly rising rotation curves, the elongations of the orbits will align along any potential valley and oscillate about it. This effect is more pronounced for elongated orbits. In such regions any pair of orbits will naturally align under their mutual gravity, and so a bar will form. The gravity of this bar will drive a spiral structure in the outer parts of the galaxy, where differential rotation is too strong to allow the orbits to be caught by the bar. The spiral structure carries a torque that slowly drains angular momentum from the bar, gradually making its outline more eccentric and slowing its pattern speed. In the outer parts of the bar only the more eccentric orbits align with the potential valley; the rounder ones form a ring or lens about the bar. As the pattern speed slows down, the corotation resonance and outer Lindblad resonance, which receive the angular momentum, move outwards.
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