Absolute proper motions of distant Galactic satellites

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astrometry, Dwarf Galaxies, Globular Clusters, Sky Surveys (Astronomy), Angular Velocity, Kinematics, Milky Way Galaxy

Scientific paper

We describe the motivation for a new program to determine the absolute proper motions (transverse velocities) for distant Galactic globular clusters and satellite dwarf spheroidal galaxies. The topic of globular-cluster proper motions is reviewed with emphasis on the correction from relative to absolute proper motions. Our project relies on astrometry from deep 2-5 m prime focus plates which contain images of numerous faint galaxies which are used to set a precise extragalactic reference frame. We discuss first results from the survey, determinations of the space motions for the clusters Palomar 5 and Palomar 3, at distances of 21 and 88 kpc, respectively.

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