Open AccessCollective Instabilities of Self-Gravitating Systems. III: Disk-Halo System
Author(s) -
Fumio Takahara,
Satoru Ikeuchi,
T. Nakamura
Publication year - 1976
Publication title -
progress of theoretical physics
Language(s) - English
Resource type - Journals
eISSN - 1347-4081
pISSN - 0033-068X
DOI - 10.1143/ptp.55.1743
Subject(s) - physics , halo , astrophysics , astronomy , galaxy
The instability modes of the infinitesimally thin self-gravitating disk, which is composed of rotating and non-rotating parts, are investigated. By solving the dispersion relation numerically under various physical situations, two growing modes are found. They are the modified Jeans mode of rotating component or non-rotating one and the Landau mode by wave-particle (non-rotating component) interactions. Possible relevances to spiral arms are discussed briefly.
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