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Can Massive Dark Haloes Destroy the Discs of Dwarf Galaxies?

Published online by Cambridge University Press:  01 June 2007

B. Fuchs  and
O. Esquivel
B. Fuchs
Affiliation:
Astronomisches Rechen-Institut am Zentrum für Astronomie der Universität Heidelberg, Mönchhofstr. 12 – 14, 69120 Heidelberg, Germany email: [email protected]
O. Esquivel
Affiliation:
Astronomisches Rechen-Institut am Zentrum für Astronomie der Universität Heidelberg, Mönchhofstr. 12 – 14, 69120 Heidelberg, Germany email: [email protected]
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Abstract

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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.

Keywords

galaxies: kinematics and dynamicsgalaxies: halos
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S244: Dark Galaxies and Lost Baryons , June 2007 , pp. 336 - 340
Copyright
Copyright © International Astronomical Union 2008

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