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Dynamical evolution of star clusters with top-heavy IMF

Published online by Cambridge University Press:  11 March 2020

Hosein Haghi Open the ORCID record for Hosein Haghi [Opens in a new window] ,
Ghasem Safaei ,
Akram H. Zonoozi  and
Pavel Kroupa
Hosein Haghi
Affiliation:
Department of Physics, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan45137-66731, Iran email: haghi@iasbs.ac.ir
Ghasem Safaei
Affiliation:
Department of Physics, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan45137-66731, Iran email: haghi@iasbs.ac.ir
Akram H. Zonoozi
Affiliation:
Department of Physics, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan45137-66731, Iran email: haghi@iasbs.ac.ir Helmholtz-Institut für Strahlen-und Kernphysik (HISKP), Universität Bonn, Rheienische Friedrich-Wilhelms Universität Nussallee 14-16, Bonn, D-53115, Germany
Pavel Kroupa
Affiliation:
Helmholtz-Institut für Strahlen-und Kernphysik (HISKP), Universität Bonn, Rheienische Friedrich-Wilhelms Universität Nussallee 14-16, Bonn, D-53115, Germany
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Abstract

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Several observational and theoretical studies suggest that the initial mass function (IMF) slope for massive stars in globular clusters (GCs) depends on the initial cloud density and metallicity, such that the IMF becomes increasingly top-heavy with decreasing metallicity and increasing the gas density of the forming object. Using N-body simulations of GCs starting with a top-heavy IMF and undergo early gas expulsion within a Milky Way-like potential, we show how such a cluster would evolve. By varying the degree of top-heaviness, we calculate the dissolution time and the minimum cluster mass needed for the cluster to survive after 12 Gyr of evolution.

Keywords

star clustersN-body simulationinitial mass function
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. 447 - 450
Copyright
© International Astronomical Union 2020

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