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On the presence of intermediate black holes in three globular clusters

Published online by Cambridge University Press:  11 March 2020

Holger Baumgardt Open the ORCID record for Holger Baumgardt [Opens in a new window] ,
Antonio Sollima Open the ORCID record for Antonio Sollima [Opens in a new window]  and
Michael Hilker Open the ORCID record for Michael Hilker [Opens in a new window]
Holger Baumgardt
Affiliation:
School of Mathematics and Physics, The University of Queensland,St. Lucia, QLD 4072, Australia
Antonio Sollima
Affiliation:
INAF Osservatorio Astronomico di Bologna, via Gobetti 93/3, Bologna, 40129, Italy
Michael Hilker
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Str.2, 85748 Garching, Germany
Rights & Permissions [Opens in a new window]

Abstract

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We investigate whether the globular clusters 47 Tuc, ω Cen and NGC 6624 contain intermediate-mass black holes (IMBHs) by fitting a large grid of N-body simulations against their surface density and velocity dispersion profiles. In our simulations we vary the initial cluster size, the initial mass function and the initial density profile of the clusters as well as the mass fraction of a central intermediate-mass black hole. We find that the surface density and velocity dispersion profiles of all three clusters can be better reproduced by models that do not contain a central IMBH than by any of our IMBH models. If ω Cen and NGC 6624 contain any IMBHs at all, they have to be significantly less massive than suggested in the past.

Keywords

globular clusters: general
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. 400 - 403
Copyright
© International Astronomical Union 2020

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