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

S. Tony Sohn, Roeland P. Van Der Marel, Alis Deason, Andrea Bellini, Gurtina Besla, Laura Watkins

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish (US)
Pages (from-to)47-50
Number of pages4
JournalProceedings of the International Astronomical Union
Volume13
Issue numberS334
DOIs
StatePublished - 2017

Keywords

  • Galaxy: globular clusters: general
  • Galaxy: halo
  • astrometry

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Astronomy and Astrophysics
  • Nutrition and Dietetics
  • Public Health, Environmental and Occupational Health
  • Space and Planetary Science

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