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Dynamics of Star Clusters with Tangentially Anisotropic Velocity Distribution by Pavlík, Václav; Heggie, Douglas C.; Varri, Anna Lisa; Vesperini, Enrico is a scholarly article available to read on EtoBox.

What is Dynamics of Star Clusters with Tangentially Anisotropic Velocity Distribution about?

Recent high-precision observations with HST and Gaia enabled new investigations of the internal kinematics of star clusters (SCs) and the dependence of kinematic properties on the stellar mass. These studies raised new questions about the dynamical evolution of self-gravitating stellar systems. We aim to develop a more complete theoretical understanding of how various kinematical properties of stars affect the global dynamical development of their host SCs. We perform N-body simulations of SCs with isotropic, radially anisotropic and tangentially anisotropic initial velocity distributions. We also study the effect of an external Galactic tidal field. We find three main results. First, compared to the conventional, isotropic case, the relaxation processes are accelerated in the tangentially anisotropic models and, in agreement with our previous investigations, slower in the radially anisotropic ones. This leads to, e.g., more rapid mass segregation in the central regions of the tangential models or their earlier core collapse. Second, although all SCs become isotropic in the inner regions after several relaxation times, we observe differences in the anisotropy profile evolution in t

Author

Pavlík, Václav; Heggie, Douglas C.; Varri, Anna Lisa; Vesperini, Enrico

Published

2024

Language

EN