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Bars in Cuspy Dark Halos

Published online by Cambridge University Press:  01 June 2008

John Dubinski ,
Ingo Berentzen  and
Isaac Shlosman
John Dubinski
Affiliation:
Department of Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto, ON M5S 3H4, Canada email: dubinski@astro.utoronto.ca
Ingo Berentzen
Affiliation:
Astronomisches Rechen-Institut, Mönchhofstr. 12-14 69120, Heidelberg, Germany email: iberent@ari.uni-heidelberg.de
Isaac Shlosman
Affiliation:
JILA, University of Colorado, Boulder, CO 80309-0440, USA Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506-0055, USA email: shlosman@pa.uky.edu
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Abstract

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We examine the bar instability in models with an exponential disk and a cuspy NFW-like dark matter (DM) halo inspired by cosmological simulations. Bar evolution is studied as a function of numerical resolution in a sequence of models spanning 104 – 108 DM particles - including a multi-mass model with an effective resolution of 1010. The goal is to find convergence in dynamical behaviour. We characterize the bar growth, the buckling instability, pattern speed decay through resonant transfer of angular momentum, and possible destruction of the DM halo cusp. Overall, most characteristics converge in behaviour for halos containing more than 107 particles in detail. Notably, the formation of the bar does not destroy the density cusp in this case. These higher resolution simulations clearly illustrate the importance of discrete resonances in transporting angular momentum from the bar to the halo.

Keywords

galaxies: spiralstructureevolutiondark mattermethods: n-body simulationsstellar dynamics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Issue S254: The Galaxy Disk in Cosmological Context , June 2008 , pp. 165 - 172
Copyright
Copyright © International Astronomical Union 2009

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