The mass of the Milky Way: orbits for Leo I and Leo II

Details The mass of the Milky Way: orbits for Leo I and Leo II The mass of the Milky Way: orbits for Leo I and Leo II

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9817k&link_type=abstract

HST Proposal ID #9817

Physics

Hst Proposal Id #9817 Galaxies

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 two satellites Leo I and Leo II, which orbit the Galaxy at about 200kpc. Together with the radial velocities of these galaxies, which are well-known, the proper motions allow space velocities to be constructed: these can remove significant uncertainty in the Galactic mass models, and in particular settle the vexed question whether Leo I is gravitationally bound to the Galaxy or not.

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