| Name: Dipanweeta Bhattacharyya |
| Affiliation: R.N.A.R. College, a constituent unit of Lalit Narayan Mithila University |
| Conference ID: ASI2026_153 |
| Title: Where can we find Black Holes ejected from Globular clusters? |
| Abstract Type: Poster |
| Abstract Category: Stars, Interstellar Medium, and Astrochemistry in Milky Way |
| Author(s) and Co-Author(s) with Affiliation: Dipanweeta Bhattacharyya(R.N.A.R. College (a constituent unit of Lalit Narayan Mithila University), Samastipur - 848101, India), Jasjeet Singh Bagla(IISER Mohali, Mohali -140306, India) |
| Abstract: We study the fate of compact objects like black holes that may be ejected from a dense system like a globular cluster. Such an ejection can be caused by three body interactions or as a result of a {\sl kick} to the remnant due to asymmetric emission of gravitational waves during a merger of black holes and other compact objects. We explore the scenario where the merger remnant in a globular cluster is moving at a significant speed with respect to the cluster centre of mass. Such a study is required as it has been conjectured that a significant fraction of the mergers detected so far reside in globular clusters. We study this in the situation when the kick velocity is higher than the escape velocity in the case of globular clusters assuming a Plummer density profile for the cluster. We study the evolution of the system to study the outcome: whether dynamical friction can trap the black hole within the globular cluster, whether the black hole escapes the globular cluster but ends up in the bulge, and lastly, whether the black hole becomes a halo object. The numerical simulations have been performed by calculating the range of kick velocities for a distribution of spin parameters of the merging black holes as well as using the data obtained from LIGO. We present results for an analysis based on orbital parameters of ten globular clusters using data from GAIA EDR3. We find that if the kick velocity is smaller than $120$ km/s then a majority of remnant black holes end up in the bulge. Note that our results in terms of where compact objects launched from a globular cluster end up are applicable to any mechanism, e.g., a compact object ejected due to three-body interactions. |
