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Stirring N-body systems - II. Necessary conditions for the dark matter attractor

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Date
05/2014
Author
Barber, Jeremy A.
Zhao, Hongsheng
Hansen, Steen H.
Funder
Science & Technology Facilities Council
Grant ID
PP/F000065/1
Keywords
Methods: numerical
Galaxies: haloes
Galaxies: kinematics and dynamics
Radial orbit instability
Space density profiles
Halos
Universal
Slope
Mergers
QB Astronomy
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Abstract
We study the evolution of the phase space of collisionless N-body systems under repeated stirrings or perturbations, which has been shown to lead to a convergence towards a limited group of end states. This so-called attractor was previously shown to be independent of the initial system and environmental conditions. However, the fundamental reason for its appearance is still unclear. It has been suggested that the origin of the attractor may be either radial infall (RI), the radial orbit instability (ROI), or energy exchange which, for instance, happens during violent relaxation. Here, we examine the effects of a set of controlled perturbations, referred to as 'kicks', which act in addition to the standard collisionless dynamics by allowing pre-specified instantaneous perturbations in phase space. We first demonstrate that the attractor persists in the absence of RI and ROI by forcing the system to expand. We then consider radial velocity kicks in a rigid potential and isotropic velocity kicks, since there are no energy exchanges in these two recipes of kicks. We find that these kicks do not lead to the attractor, indicating that the energy exchange in a dynamic potential is indeed the physical mechanism responsible for the attractor.
Citation
Barber , J A , Zhao , H & Hansen , S H 2014 , ' Stirring N-body systems - II. Necessary conditions for the dark matter attractor ' , Monthly Notices of the Royal Astronomical Society , vol. 440 , no. 2 , pp. 1044-1051 . https://doi.org/10.1093/mnras/stu407
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
DOI
https://doi.org/10.1093/mnras/stu407
ISSN
0035-8711
Type
Journal article
Rights
© 2014. The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.
Description
This work is supported in part by the Science and Technology Facilities Council.
Collections
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/5070

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