BH2 - Theoretical and observational studies of astrophysical black holes |
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Speaker |
Arca Sedda, Manuel |
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Coauthors |
Askar, A. ; Giersz, M. |
| Talk Title |
Dancing in the dark: how to unveil a black hole subsystem sitting in the centre of a globular cluster |
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Abstract |
In this talk, we discuss how globular clusters (GCs) structural and observational properties can be used to infer the presence of a black hole system (BHS) inhabiting their inner regions. We propose a novel way to identify the BHS size, defined as the GC radius containing a mass contributed equally from stars and stellar BHs. 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, $\rho_\bhs \sim 10-10^5\Ms$ pc$^{-3}$ and composed of relatively massive BHs, with average masses in the range $m_\bhs = 14-22\Ms$. We showed also that a similar approach can be used to find Milky Way GCs potentially hosting an intermediate-mass black hole. |
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