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Constraining the Formation and Mass of the Milky Way Halo using Globular Cluster Orbits from HST Proper Motions

Published online by Cambridge University Press:  02 August 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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The globular cluster (GC) system of the Milky Way (MW) provides important information on the MW’s present structure and past evolution. Full 3d motions, accessed through proper motions (PMs), are required to calculate accurate orbits of GCs in the MW halo. We present our HST program to create a PM database for 20 halo GCs. We demonstrate how the observed PMs of individual GCs can be used to study their origins, and we also describe how the PM measurements of our entire targets can be used to constrain the anisotropy profile. Finally, we describe how our PM results can be used for Gaia as an external check, and discuss prospects of PM measurements with HST and Gaia in the coming years.

Keywords

astrometryGalaxy: globular clusters: generalGalaxy: halo
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S334: Rediscovering our Galaxy , July 2017 , pp. 47 - 50
Copyright
Copyright © International Astronomical Union 2018 

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