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Monte Carlo modeling of globular star clusters: many primordial binaries and IMBH formation

Published online by Cambridge University Press:  07 March 2016

Mirek Giersz ,
Nathan Leigh ,
Michael Marks ,
Arkadiusz Hypki  and
Abbas Askar
Mirek Giersz
Affiliation:
Nicolaus Copernicus Astronomical Centre, Polish Academy of Sciences, ul. Bartycka 18, 00-716 Warsaw, Poland emails: mig@camk.edu.pl
Nathan Leigh
Affiliation:
Department of Physics, University of Alberta, CCIS 4-183, Edmonton, AB T6G 2E1, Canada
Michael Marks
Affiliation:
Helmholtz-Institut für Strahlen- und Kernphysik, Nussallee 14-16, D-53115, Bonn, Germany
Arkadiusz Hypki
Affiliation:
Nicolaus Copernicus Astronomical Centre, Polish Academy of Sciences, ul. Bartycka 18, 00-716 Warsaw, Poland emails: mig@camk.edu.pl
Abbas Askar
Affiliation:
Nicolaus Copernicus Astronomical Centre, Polish Academy of Sciences, ul. Bartycka 18, 00-716 Warsaw, Poland emails: mig@camk.edu.pl
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Abstract

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We will discuss the evolution of star clusters with a large initial binary fraction, up to 95%. The initial binary population is chosen to follow the invariant orbital-parameter distributions suggested by Kroupa (1995). The Monte Carlo MOCCA simulations of star cluster evolution are compared to the observations of Milone et al. (2012) for photometric binaries. It is demonstrated that the observed dependence on cluster mass of both the binary fraction and the ratio of the binary fractions inside and outside of the half mass radius are well recovered by the MOCCA simulations. This is due to a rapid decrease in the initial binary fraction due to the strong density-dependent destruction of wide binaries described by Marks, Kroupa & Oh (2011). We also discuss a new scenario for the formation of intermediate mass black holes in dense star clusters. In this scenario, intermediate mass black holes are formed as a result of dynamical interactions of hard binaries containing a stellar mass black hole, with other stars and binaries. We will discuss the necessary conditions to initiate the process of intermediate mass black hole formation and the dependence of its mass accretion rate on the global cluster properties.

Keywords

stellar dynamics – globular clusters: general – binaries: general – methods: numerical
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S312: Star Clusters and Black Holes in Galaxies across Cosmic Time , August 2014 , pp. 213 - 222
Copyright
Copyright © International Astronomical Union 2016 

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