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A simple two-component description of mass segregation for anisotropic globular clusters

Published online by Cambridge University Press:  11 March 2020

S. Torniamenti Open the ORCID record for S. Torniamenti [Opens in a new window] ,
G. Bertin  and
P. Bianchini Open the ORCID record for P. Bianchini [Opens in a new window]
S. Torniamenti
Affiliation:
Università degli Studi di Milano, Dipartimento di Fisica, via Celoria 16, 20133Milano, Italy emails: stefano.torniamenti@studenti.unimi.it, giuseppe.bertin@unimi.it
G. Bertin
Affiliation:
Università degli Studi di Milano, Dipartimento di Fisica, via Celoria 16, 20133Milano, Italy emails: stefano.torniamenti@studenti.unimi.it, giuseppe.bertin@unimi.it
P. Bianchini
Affiliation:
Observatoire Astronomique de Strasbourg, 11 Rue de l’Université, 67000Strasbourg, France email: paolo.bianchini@astro.unistra.fr
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Abstract

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As a result of the slow action of two-body encounters, globular clusters develop mass segregation and attain a condition of only partial energy equipartition even in their central, most relaxed regions. Realistic numerical simulations show that, during the process, a radially-biased anisotropy profile slowly builds up, mimicking that resulting from incomplete violent relaxation. Commonly used dynamical models, such as the one-component King models, cannot describe these properties. Here we show that simple two-component models based on a distribution function originally conceived to describe elliptical galaxies, recently truncated and adapted to the context of globular clusters, can describe in detail what is observed in complex and realistic numerical simulations.

Keywords

globular clusters: generalstellar dynamicsstars: kinematics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S351: Star Clusters: From the Milky Way to the Early Universe , May 2019 , pp. 528 - 531
Copyright
© International Astronomical Union 2020

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