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

Published online by Cambridge University Press:  07 March 2018

S. Tony Sohn
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore 21218, USA email:[email protected]
Roeland P. van der Marel
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore 21218, USA email:[email protected]
Alis Deason
Affiliation:
Institute for Computational Cosmology, Department of Physics, Durham University, South Road, Durham DH1 3LE, UK
Andrea Bellini
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore 21218, USA email:[email protected]
Gurtina Besla
Affiliation:
Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA
Laura Watkins
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore 21218, USA email:[email protected]
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Abstract

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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 RGC = 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.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2018 

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