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Picture of Abbas Askar

Abbas Askar

Postdoc

Picture of Abbas Askar

Stellar-mass Black Holes in Globular Clusters : Dynamical consequences and observational signatures

Author

  • Abbas Askar
  • Mirek Giersz
  • Manuel Arca Sedda
  • Ammar Askar
  • Mario Pasquato
  • Agostino Leveque

Summary, in English

Sizeable number of stellar-mass black holes (BHs) in globular clusters (GCs) can strongly influence the dynamical evolution and observational properties of their host cluster. Using results from a large set of numerical simulations, we identify the key ingredients needed to sustain a sizeable population of BHs in GCs up to a Hubble time. We find that while BH natal kick prescriptions are essential in determining the initial retention fraction of BHs in GCs, the long-Term survival of BHs is determined by the size, initial central density and half-mass relaxation time of the GC. Simulated GC models that contain many BHs are characterized by relatively low central surface brightness, large half-light and core radii values. We also discuss novel ways to compare simulated results with available observational data to identify GCs that are most likely to contain many BHs.

Department/s

  • Lund Observatory

Publishing year

2019

Language

English

Pages

395-399

Publication/Series

Proceedings of the International Astronomical Union

Volume

14

Issue

351

Document type

Journal article

Publisher

Cambridge University Press

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • globular clusters: general
  • stars: black holes
  • stellar dynamics

Status

Published

ISBN/ISSN/Other

  • ISSN: 1743-9213