Early dynamics and violent relaxation of multi-mass rotating star clusters

Alexander Livernois*, Enrico Vesperini, Maria Tiongco, Anna Lisa Varri, Emanuele Dalessandro

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

We present the results of a study aimed at exploring, by means of N-body simulations, the evolution of rotating multi-mass star clusters during the violent relaxation phase, in the presence of a weak external tidal field. We study the implications of the initial rotation and the presence of a mass spectrum for the violent relaxation dynamics and the final properties of the equilibria emerging at the end of this stage. Our simulations show a clear manifestation of the evolution towards spatial mass segregation and evolution towards energy equipartition during and at the end of the violent relaxation phase. We study the final rotational kinematics and show that massive stars tend to rotate more rapidly than low-mass stars around the axis of cluster rotation. Our analysis also reveals that during the violent relaxation phase, massive stars tend to preferentially segregate into orbits with angular momentum aligned with the cluster's angular momentum, an effect previously found in the context of the long-term evolution of star clusters driven by two-body relaxation.
Original languageEnglish
Pages (from-to)5781-5801
Number of pages21
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
Early online date26 Jul 2021
Publication statusPublished - 1 Oct 2021

Keywords / Materials (for Non-textual outputs)

  • astro-ph.GA


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