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| Paper: |
Old-fashion Approach to Kinematically Decoupled Cores in Elliptical Galaxies |
| Volume: |
197, XVth IAP Meeting Dynamics of Galaxies: From the Early Universe to the Present |
| Page: |
243 |
| Authors: |
Boily, Christian M. |
| Abstract: |
Collapsing cold spheroids are prone to surface and radial-orbit modes of instability leading to triaxial configurations in equilibrium (Merritt 1999). When the mass distribution is not reflected through the equator, a net torque may act on the central region as the modes grow. The twist sets the central part and the outer-reach of the galaxy rotating in opposite direction. Can the equilibria show a dynamically decoupled central part, as observed for KDC ellipticals (eg, Carter et al. 1998; Hau et al. 1999)? To address this issue I have sought a stringent test for the survival of streaming motion the above setup would give rise to. I built on an analytic model to find out when the accrued angular momentum should be optimum: this is when a corrugated density mode ω is of amplitude the initial aspect ratio or more (eq. [1]). Analysis ends when the systems rebound, and numerical simulations are used to probe the virialised equilibria. |
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