Kinematical evolution of tidally limited star clusters: rotational properties

Maria A. Tiongco, Enrico Vesperini, Anna Lisa Varri

Research output: Contribution to journalArticlepeer-review

Abstract

We present the results of a set of N-body simulations following the long-term evolution of the rotational properties of star cluster models evolving in the external tidal field of their host galaxy, after an initial phase of violent relaxation. The effects of two-body relaxation and escape of stars lead to a redistribution of the ordered kinetic energy from the inner to the outer regions, ultimately determining a progressive general loss of angular momentum; these effects are reflected in the overall decline the rotation curve as the cluster evolves and loses stars. We show that all of our models share the same dependence of the remaining fraction of the initial rotation on the fraction of the initial mass lost. As the cluster evolves and loses part of its initial angular momentum, it becomes increasingly dominated by random motions, but even after several tens of relaxation times, and losing a significant fraction of its initial mass, a cluster can still be characterized by a non-negligible ratio of the rotational velocity to the velocity dispersion. This result is in qualitative agreement with the recently observed kinematical complexity which characterizes several Galactic globular clusters.
Original languageEnglish
Pages (from-to)683-692
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Volume469
Issue number1
Early online date8 Apr 2017
DOIs
Publication statusPublished - 1 Jul 2017

Keywords

  • Astrophysics - Astrophysics of Galaxies

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