Computer Science
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11770r&link_type=abstract
HST Proposal ID #11770. Cycle 17
Computer Science
Scientific paper
Constraining the mass of the Galaxy at large radii remains a difficult problem. Available data are still rather scarce, and orbits of even a few objects at large radii can have a large impact. We propose to obtain proper motions for the Galaxy's two most remote satellites, Leo I and Leo II, which orbit the Galaxy at about 200 kpc. Together with the radial velocities of these galaxies, which are well known, the proper motions allow space velocities to be consructed: these can remove signifiicant uncertainty in the Galactic mass models, and in particular settle the vexed question of whether or not Leo I is gravitationally bound to the Galaxy. The proper motion of Leo I as derived from archival ACS and WFPC2 data is addressed in this proposal, while a companion {approved Cycle 16} WFPC2 imaging proposal addresses the orbit of Leo II.;
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