| Issue |
A&A
Volume 468, Number 3, June IV 2007
Extended baselines for the IRAM Plateau de Bure interferometer: First results
|
|
|---|---|---|
| Page(s) | 803 - 805 | |
| Section | Astrophysical processes | |
| DOI | https://doi.org/10.1051/0004-6361:20077372 | |
| Published online | 11 April 2007 | |
Jeans instability of a galactic disk embedded in a live dark halo
Astronomisches Rechen-Institut am Zentrum für Astronomie der Universität Heidelberg, Mönchhofstr. 12–14, 69120 Heidelberg, Germany e-mail: esquivel@ari.uni-heidelberg.de
Received:
28
February
2007
Accepted:
3
April
2007
We investigate the Jeans instability of a galactic disk embedded in a dynamically responsive dark halo. It is shown that the disk-halo system becomes nominally Jeans unstable. On small scales the instability is suppressed, if the Toomre stability index QT is higher than a certain threshold, but on large scales the Jeans instability sets invariably in. However, using a simple self-consistent disk-halo model it is demonstrated that this occurs on scales which are much larger than the system so that this is indeed only a nominal effect. From a practical point of view the Jeans instability of galactic disks is not affected by a live dark halo.
Key words: galaxies: kinematics and dynamics / galaxies: halos
© ESO, 2007
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