G. N. Candlish
Phase mixing due to the Galactic potential: steps in the position and velocity distributions of popped star clusters
Candlish, G. N.; Smith, R.; Fellhauer, M.; Gibson, B. K.; Kroupa, P.; Assmann, P.
Authors
R. Smith
M. Fellhauer
B. K. Gibson
P. Kroupa
P. Assmann
Abstract
As star clusters are expected to form with low star formation efficiencies, the gas in the cluster is expelled quickly and early in their development: the star cluster ‘pops’. This leads to an unbound stellar system, evolving in the Galactic potential. Previous N-body simulations have demonstrated the existence of a stepped number density distribution of cluster stars after popping, both in vertical position and vertical velocity, with a passing resemblance to a Christmas tree. Using numerical and analytical methods, we investigate the source of this structure, which arises due to the phase mixing of the out-of-equilibrium stellar system, determined entirely by the background analytic potential. Considering only the vertical motions, we construct a theoretical model to describe the time evolution of the phase space distribution of stars in a Miyamoto–Nagai disc potential and a full Milky Way-type potential comprising bulge, halo and disc components, which is then compared with N-body simulations. Using our theoretical model, we investigate the possible observational signatures and the feasibility of detection.
Citation
Candlish, G. N., Smith, R., Fellhauer, M., Gibson, B. K., Kroupa, P., & Assmann, P. (2014). Phase mixing due to the Galactic potential: steps in the position and velocity distributions of popped star clusters. Monthly notices of the Royal Astronomical Society, 437(4), 3702-3717. https://doi.org/10.1093/mnras/stt2166
Journal Article Type | Article |
---|---|
Acceptance Date | Nov 6, 2013 |
Online Publication Date | Dec 6, 2013 |
Publication Date | Feb 1, 2014 |
Deposit Date | Apr 14, 2016 |
Publicly Available Date | Mar 29, 2024 |
Journal | Monthly notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Oxford University Press |
Peer Reviewed | Peer Reviewed |
Volume | 437 |
Issue | 4 |
Pages | 3702-3717 |
DOI | https://doi.org/10.1093/mnras/stt2166 |
Keywords | Gravitation, Methods : analytical, Methods : numerical, Galaxies : star clusters : general |
Public URL | https://hull-repository.worktribe.com/output/436116 |
Publisher URL | http://mnras.oxfordjournals.org/content/437/4/3702 |
Additional Information | This article has been accepted for publication in Monthly notices of the Royal Astronomical Society ©: 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
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Copyright Statement
© 2013 The Authors
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