Can Massive Dark Haloes Destroy the Disks of Dwarf Galaxies?
Proceedings of The International Astronomical Union(2008)
摘要
Recent high-resolution simulations together with theoretical studies of the
dynamical evolution of galactic disks have shown that contrary to wide-held
beliefs a `live', dynamically responsive, dark halo surrounding a disk does not
stabilize the disk against dynamical instabilities. We generalize Toomre's Q
stability parameter for a disk-halo system and show that if a disk, which would
be otherwise stable, is embedded in a halo, which is too massive and cold, the
combined disk-halo system can become locally Jeans unstable. The good news is,
on the other hand, that this will not happen in real dark haloes, which are in
radial hydrostatic equilibrium. Even very low-mass disks are not prone to such
dynamical instabilities.
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关键词
dark halo.,galactic disks: stability
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