Proper Motion of the Sagittarius Dwarf Galaxy-Cycle 9

Details Proper Motion of the Sagittarius Dwarf Galaxy-Cycle 9 Proper Motion of the Sagittarius Dwarf Galaxy-Cycle 9

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8778i&link_type=abstract

HST Proposal ID #8778

Physics

Hst Proposal Id #8778

Scientific paper

We propose to use the unique spatial resolution of the HST to determine the proper motion of the Sagittarius dwarf galaxy {Sgr}. Three fields, previously imaged in May - June 1996, will be imaged again in cycle 7 and late in cycle 9. This will yield a baseline of 3-4 years from which the proper motion of Sgr will be measured to an accuracy of 35 km/s. The proper motion information coupled with our extensive ground- based radial velocity and heliocentric distance data, will permit an accurate determination of the orbit of the dwarf galaxy. This crucial new information will allow us to study the interaction between Sgr and the Milky Way in detail. Among the scientific issues which depend on an accurate orbit for their analysis, we will test the possibility that Sgr generates the warp in the Milky Way disk; we will quantify the effect on the star formation and chemical evolution of both Sgr and the outer Milky Way disk of the successive passages of Sgr through the Galactic disk potential; and we will limit the flattening of the Galactic dark halo.

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