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Please use this identifier to cite or link to this item: http://hdl.handle.net/1860/2564

Title: A dynamical origin for early mass segregation in young star clusters
Authors: McMillan, Stephen L.W.
Vesperini, Enrico
Zwart, Simon F. Portegies
Keywords: Star Clusters;General
Issue Date: 19-Sep-2006
Publisher: University of Chicago Press
Citation: Astrophysical Journal, 665: pp. L45-L48.
Abstract: Some young star clusters show a degree of mass segregation that is inconsistent with the effects of standard two-body relaxation from an initially unsegregated system without substructure, in virial equilibrium, and it is unclear whether cur- rent cluster formation models can account for this degree of initial segregation in clusters of significant mass. In this Letter we demonstrate that mergers of small clumps that are either initially mass segregated, or in which mass segrega- tion can be produced by two-body relaxation before they merge, generically lead to larger systems which inherit the progenitor clumps’ segregation. We conclude that clusters formed in this way are naturally mass segregated, accounting for the anomalous observations and suggesting that this process of prompt mass segre- gation due to initial clumping should be taken fully into account in constructing cluster dynamical models.
URI: http://aps.arxiv.org/abs/astro-ph/0609515v1
Appears in Collections:Faculty Research and Publications (Physics)

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