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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 Open the ORCID record for S. Tony Sohn [Opens in a new window] ,
Roeland P. van der Marel ,
Alis Deason ,
Andrea Bellini ,
Gurtina Besla  and
Laura Watkins
S. Tony Sohn
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore 21218, USA email:tsohn@stsci.edu
Roeland P. van der Marel
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore 21218, USA email:tsohn@stsci.edu
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:tsohn@stsci.edu
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:tsohn@stsci.edu
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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.

Keywords

astrometryGalaxy: evolutionGalaxy: formationGalaxy: globular clusters: generalGalaxy: halo
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S330: Astrometry and Astrophysics in the Gaia sky , April 2017 , pp. 261 - 262
Copyright
Copyright © International Astronomical Union 2018 

References

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