A Q-barrier in the Goldreich & Lynden - Bell sheet: From shearing density waves to modes

Details A Q-barrier in the Goldreich & Lynden - Bell sheet: From shearing density waves to modes A Q-barrier in the Goldreich & Lynden - Bell sheet: From shearing density waves to modes

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998egdg.conf...95f&link_type=abstract

"Dynamics of Galaxies and Galactic Nuclei, An International Workshop of the SFB 328 "Evolution of Galaxies" held at the ITA Nove

Physics

Scientific paper

The dynamics of the stellardynamical analogue of the GLB sheet, which serves as a model of a patch of a galactic disk, is studied. It is shown that, if free boundary conditions are assumed, only shearing, `swing amplified' density waves develop. If a left-hand boundary which represents a Q-barrier, i.e. dynamically inactive inner parts of the galactic disk, is considered, density waves with well defined angular frequencies and growth rates appear. It is argued that these rigidly rotating modes are still due to the `swing-amplification' mechanism operating in the disk.

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