Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.240..991s&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 240, Oct. 15, 1989, p. 991-1007.
Astronomy and Astrophysics
Astronomy
49
Accretion Disks, Galactic Structure, Gravitational Effects, Particle Motion, Spiral Galaxies, Wave Scattering, Angular Momentum, Disk Galaxies, Dynamic Stability
Scientific paper
A new type of small-amplitude spiral mode was discovered in collisionless, self-gravitating disks. It is a fierce dynamical instability which appears to be driven by a trough, or 'groove', in the phase space density at a particular angular momentum. At large amplitude, the wave scatters particles at its Lindblad resonances, which are sufficiently well localized to create new grooves in phase space at which new linear instabilities of the same type can develop. Resonant scattering also leads to a general increase in noncircular motions within the disk, so the recurrent cycle ends, in the absence of cooling, when the entire disk is so hot that coherent waves can no longer be sustained. Disks that are cooled, however, should support this instability cycle indefinitely.
Lin Doug N. C.
Sellwood Jeremy A.
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