Jeans instability of a galactic disk embedded in a live dark halo

Details Jeans instability of a galactic disk embedded in a live dark halo Jeans instability of a galactic disk embedded in a live dark halo

2007-04-13

arxiv.org/abs/0704.1766v1

Astronomy and Astrophysics

Astrophysics

3 pages, 1 figure, accepted by Astron. Astrophys

Scientific paper

10.1051/0004-6361:20077372

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 Q_T 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.

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