Accurate proper motions of Galactic halo populations

Details Accurate proper motions of Galactic halo populations Accurate proper motions of Galactic halo populations

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8095i&link_type=abstract

HST Proposal ID #8095

Computer Science

Hst Proposal Id #8095 Field Stellar Populations

Scientific paper

We propose to use the superb spatial resolution of the WFPC2 camera to obtain second epoch exposures in the fields of several Galactic halo globular clusters and dwarf satellite galaxies. The proper motions of these populations will thereby be determined to unprecedented accuracy, approximately an order of magnitude better than has been previously possible. This will improve our understanding of the shape and distribution of the dark matter halo of the Milky Way, it will allow better scrutiny of formation models of the halo, it will allow us to investigate the dynamical evolution of the Galactic satellites, and it will help constrain the dynamics of foreground Galactic components. Stellar populations studies of the Galactic halo objects can be {in some cases, substantially} improved, since contaminants from foreground stellar populations and background galaxian populations will be excluded from color-magnitude diagrams and luminosity functions. Furthermore, we may also discover high redshift supernovae.

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