AAS 197, January 2001
Session 30. Dwarf and Elliptical Galaxies
Oral, Monday, January 8, 2001, 1:30-3:00pm, Royal Plam 5/6

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[30.04] Tidal Disruptions of the Ursa Minor and Draco Dwarf Spheroidal Galaxies

D. D. Kocevski, J. R. Kuhn (Institute for Astronomy)

Several of the local group dwarf spheroidal (dS) galaxies show evidence of inflated velocity dispersions. A likely model for Ursa Minor, Carina, and Draco is that their tidal interaction with the Milky Way has pushed them far from virial equilibrium. We have obtained wide-field V and I band photometry of the Ursa Minor and Draco dS galaxies using the 12K CCD mosaic detector on the Canada-France-Hawaii telescope. We present here the results of a sensitive search for extratidal stars out to distances of 4 degrees from the centers of these galaxies. We discuss the implications of these results for dark matter and Milky Way tidal interaction models.

The author(s) of this abstract have provided an email address for comments about the abstract: kocevski@ifa.hawaii.edu

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