Stellar graveyards: Clustering of compact objects in globular clusters NGC 3201 and NGC 6397

Understand

We analyse Gaia EDR3 and re-calibrated HST proper motion data from the core-collapsed and non core-collapsed globular clusters NGC 6397 and NGC 3201, respectively, with the Bayesian mass-orbit modelling code MAMPOSSt-PM.

• We use Bayesian evidence and realistic mock data sets constructed with AGAMA to select between different mass models.
• In both clusters, the velocities are consistent with isotropy within the extent of our data.
• We robustly detect a dark central mass (DCM) of roughly 1000 solar masses in both clusters.