Globular Clusters and Dark Matter (sub) Halos

Speaker: 
Prof. Ray Carlberg (University of Toronto)
Date: 
Tuesday, May 24, 2022 - 11:00am

Decades of observational data and careful modeling show that stars dominate the gravitational field of the inner 2-3 half-mass radii of globular clusters. Gaia (and other new instruments) are providing kinematic data in the outskirts of globular clusters which allows new tests for dark matter and comparison with models. At least10% of the clusters with sufficient data exhibit the kinematic signature of a local dark halo, including M54 and M13. A local dark halo will increase the retention of gas and black hole binaries.

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