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dc.contributor.authorBarber, Jeremy A.
dc.contributor.authorZhao, Hongsheng
dc.contributor.authorHansen, Steen H.
dc.identifier.citationBarber , 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 .
dc.identifier.otherPURE: 134770587
dc.identifier.otherPURE UUID: 60b22afe-eb54-4bba-b434-dfdc7adff1d1
dc.identifier.otherWOS: 000334742200008
dc.identifier.otherScopus: 84898962329
dc.identifier.otherWOS: 000334742200008
dc.descriptionThis work is supported in part by the Science and Technology Facilities Council.en
dc.description.abstractWe 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.
dc.relation.ispartofMonthly Notices of the Royal Astronomical Societyen
dc.rights© 2014. The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.en
dc.subjectMethods: numericalen
dc.subjectGalaxies: haloesen
dc.subjectGalaxies: kinematics and dynamicsen
dc.subjectRadial orbit instabilityen
dc.subjectSpace density profilesen
dc.subjectQB Astronomyen
dc.titleStirring N-body systems - II. Necessary conditions for the dark matter attractoren
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.School of Physics and Astronomyen
dc.description.statusPeer revieweden

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