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Mass segregation in star clusters is not energy equipartition

Parker, RJ and Goodwin, SP and Wright, NJ and Meyer, MR and Quanz, SP (2016) Mass segregation in star clusters is not energy equipartition. Monthly Notices of the Royal Astronomical Society Letters. ISSN 1745-3933

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Abstract

Mass segregation in star clusters is often thought to indicate the onset of energy equipartition, where the most massive stars impart kinetic energy to the lower-mass stars and brown dwarfs/free floating planets. The predicted net result of this is that the centrally concentrated massive stars should have significantly lower velocities than fast-moving low-mass objects on the periphery of the cluster. We search for energy equipartition in initially spatially and kinematically substructured N-body simulations of star clusters with N = 1500 stars, evolved for 100 Myr. In clusters that show significant mass segregation we find no differences in the proper motions or radial velocities as a function of mass. The kinetic energies of all stars decrease as the clusters relax, but the kinetic energies of the most massive stars do not decrease faster than those of lower-mass stars. These results suggest that dynamical mass segregation -- which is observed in many star clusters -- is not a signature of energy equipartition from two-body relaxation.

Item Type: Article
Additional Information: This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society Letters following peer review. The version of record "Mass segregation in star clusters is not energy equipartition" is available online at http://dx.doi.org/10.1093/mnrasl/slw061
Uncontrolled Keywords: astro-ph.GA; astro-ph.GA
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 15 Apr 2016 08:44
Last Modified: 23 May 2016 13:51
URI: http://researchonline.ljmu.ac.uk/id/eprint/3432

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