Seminars

Seminars

Martedi 25 Maggio 2021, h. 11:00

ZOOM virtual meeting


Fabio Antonini

Gravity Exploration Institute, School of Physics and Astronomy, Cardiff University, Cardiff,

Black hole dynamics in dense star clusters

ABSTRACT

Several black hole binaries have been detected by the Advanced LIGO and Virgo interferometers. While the astrophysical origin of these sources is still unknown, one possibility is that they formed in dense star clusters through dynamical three-body interactions. I will discuss the results from a library of ~10 million globular cluster models that were obtained using our new fast code cBHBd. I will show that when uncertainties are properly considered, a scenario in which most of the detected sources are formed in globular clusters is consistent with current constraints. Finally, I will discuss the results of N-body models of the globular cluster Palomar 5. These models show that the cluster extremely diffuse core and extended tidal tails can be explained if about 20% of its mass is in black holes.