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HST Proper Motions of Distant Globular Clusters: Constraining the Formation & Mass of the Milky Way

  • S. Tony Sohn (a1), Roeland P. van der Marel (a1), Alis Deason (a2), Andrea Bellini (a1), Gurtina Besla (a3) and Laura Watkins (a1)...

Abstract

Proper motions (PMs) are required to calculate accurate orbits of globular clusters (GCs) in the Milky Way (MW) halo. We present our HST program to create a PM database for 20 GCs at distances of R GC = 10–100 kpc. Targets are discussed along with PM measurement methods. We also describe how our PM results can be used for Gaia as an external check, and discuss the synergy between HST and Gaia as astrometric instruments in the coming years.

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References

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Keywords

HST Proper Motions of Distant Globular Clusters: Constraining the Formation & Mass of the Milky Way

  • S. Tony Sohn (a1), Roeland P. van der Marel (a1), Alis Deason (a2), Andrea Bellini (a1), Gurtina Besla (a3) and Laura Watkins (a1)...

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