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Picture of Abbas Askar

Abbas Askar

Postdoc

Picture of Abbas Askar

MOCCA-Survey Database I. Unravelling black hole subsystems in globular clusters

Author

  • Manuel Arca Sedda
  • Abbas Askar
  • Mirek Giersz

Summary, in English

In this paper, we discuss how the structural and observational properties of globular clusters (GCs) can be used to infer the presence of a black hole system (BHS) inhabiting their inner regions. We propose a novel way to define the BHS size as the radius from the GC centre within which half of the mass is in stellar mass BHs and the remaining half is in other stars. Using this definition, similar to the well-known concept of ‘influence radius’, we found a ‘fundamental plane’ connecting the BHS typical density with the GC central surface density profile, total luminosity and observational half-mass radius. Our approach allows us to define a unique way to connect the observational GCs parameters with their dark content. Comparing our results with observed Milky Way GCs, we found that many of them likely host, at the present time, as many as several hundreds of BHs. These BHS are characterized by a relatively low typical density, pc−3 and composed of relatively massive BHs, with average masses in the range m BHS =14−22M ⊙
mBHS=14−22M⊙
⁠. We also show that a similar approach can be used to find Milky Way GCs potentially hosting an intermediate-mass black hole.

Publishing year

2018-07-01

Language

English

Pages

4652-4664

Publication/Series

Monthly Notices of the Royal Astronomical Society

Volume

479

Issue

4

Document type

Journal article

Publisher

Oxford University Press

Topic

  • Astronomy, Astrophysics and Cosmology

Status

Published

ISBN/ISSN/Other

  • ISSN: 1365-2966