Angular momentum redistribution by spiral waves in computer models of disc galaxies

Details Angular momentum redistribution by spiral waves in computer models of disc galaxies Angular momentum redistribution by spiral waves in computer models of disc galaxies

May 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.187..483s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 187, May 1979, p. 483-496.

Computer Science

Graphics

6

Angular Momentum, Galactic Structure, Momentum Transfer, Spiral Galaxies, Astronomical Models, Computer Graphics, Computerized Simulation, Disks (Shapes), Mass Distribution, Resonance

Scientific paper

It is shown that the spiral patterns which develop spontaneously in computer models of galaxies are generated through angular momentum transfer, as first proposed by Lynden-Bell and Kalnais. By adjusting the distribution of mass in the rigid halo components of the models it is possible to alter radically the rotation curve of the disk component. Either trailing or leading spiral arms develop in the models, dependent only on the sense of the differential shear; no spirals are seen in models where the disk rotates uniformly. It is found that the distribution of angular momentum in the disk is altered by the spiral evolution. Although some spiral structure can be seen for a long period, the life of each pattern is very short. It is shown that resonances are of major importance even for these transient patterns. All spiral wave patterns which have been seen possess both an inner Lindblad resonance and a corotation resonance. If their presence is taken as a requirement for the development of a pattern, an alternative explanation for the prevalence of two-arm structure in spiral galaxies is possible.

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