Journal Article

Stirring <i>N</i>-body systems: universality of end states

Jeremy A. Barber, Hongsheng Zhao, Xufen Wu and Steen H. Hansen

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 424, issue 3, pages 1737-1751
Published in print August 2012 | ISSN: 0035-8711
Published online August 2012 | e-ISSN: 1365-2966 | DOI:
Stirring N-body systems: universality of end states

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We study the evolution of the phase space of collisionless N-body systems under repeated stirrings or perturbations. We find convergence towards a limited solution group, in accordance with Hansen, Juncher & Sparre, that is independent of the initial system and environmental conditions, paying particular attention to the assumed gravitational paradigm (Newtonian and Modified Newtonian Dynamics). We examine the effects of changes to the perturbation scheme and in doing so identify a large group of perturbations featuring radial orbit instability which always lead to convergence. The attractor is thus found to be a robust and reproducible effect under a variety of circumstances.

Keywords: gravitation; methods: numerical; Galaxy: kinematics and dynamics; galaxies: haloes; galaxies: interactions

Journal Article.  10564 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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