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Picture of Abbas Askar

Abbas Askar

Postdoc

Picture of Abbas Askar

MOCCA-Survey Database I: Galactic globular clusters harbouring a black hole subsystem

Author

  • Abbas Askar
  • Manuel Arca Sedda
  • Mirek Giersz

Summary, in English

There have been increasing theoretical speculations and observational indications that certain globular clusters (GCs) could contain a sizeable population of stellar mass black holes (BHs). In this paper, we shortlist at least 29 Galactic GCs that could be hosting a subsystem of BHs (BHS). In a companion paper, we analysed results from a wide array of GC models (simulated with the MOCCA code for cluster simulations) that retained few tens to several hundreds of BHs at 12 Gyr and showed that the properties of the BHS in those GCs correlate with the GC’s observable properties. Building on those results, we use available observational properties of 140 Galactic GCs to identify 29 GCs that could potentially be harbouring up to a few hundreds of BHs. Utilizing observational properties and theoretical scaling relations, we estimate the density, size, and mass of the BHS in these GCs. We also calculate the total number of BHs and the fraction of BHs contained in a binary system for our shortlisted Galactic GCs. Additionally, we mention other Galactic GCs that could also contain a significant number of single BHs or BHs in binary systems.

Publishing year

2018-05-01

Language

English

Pages

1844-1854

Publication/Series

Monthly Notices of the Royal Astronomical Society

Volume

478

Issue

2

Document type

Journal article

Publisher

Oxford University Press

Topic

  • Astronomy, Astrophysics and Cosmology

Status

Published

ISBN/ISSN/Other

  • ISSN: 1365-2966