Can dust destabilize galactic disks?
| dc.creator | Theis, Ch. | |
| dc.creator | Orlova, N. | |
| dc.date | 2004-03-16 | |
| dc.date.accessioned | 2026-07-07T06:31:57Z | |
| dc.date.available | 2026-07-07T06:31:57Z | |
| dc.description | We studied the dynamical influence of a dust component on the gaseous phase in central regions of galactic disks. Therefore, we performed two-dimensional hydrodynamical simulations for flat multi-component disks embedded in a stellar and dark matter potential. The pressure-free dust component is coupled to the gas by a drag force depending on their velocity difference. It turned out that the most unstable regions are those with either a low or near to minimum Toomre parameter or with rigid rotation, i.e. the central area. In that regions the dust-free disks become most unstable for a small range of high azimuthal modes (m \sim 8), whereas in dusty disks all modes have similar amplitudes resulting in a patchy appearance. The structures in the dust have a larger contrast between arm and inter-arm regions than those of the gas. The dust peaks are frequently correlated with peaks of the gas distribution, but they do not necessarily coincide with them. This leads to a large scatter in the dust-to-gas ratios. The appearance of the dust is more cellular (i.e. sometimes connecting different spiral features), whereas the gas is organized in a multi-armed spiral structure. We found that an admixture of 2% dust (relative to the mass of the gas) destabilizes gaseous disks substantially, whereas dust-to-gas ratios below 1% have no influence on the evolution of the gaseous disk. For a high dust-to-gas ratio of 10% the instabilities reach the saturation level already after 30 Myr. | |
| dc.description | 4 pages including 2 figures, to appear in PASA (Refereed contribution to the 5th Galactic Chemodynamics conference held in Swinburne, July 2003) | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0403377 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0403377 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/98762 | |
| dc.subject | Astrophysics | |
| dc.title | Can dust destabilize galactic disks? | |
| dc.type | text |