Other
Scientific paper
Aug 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008noao.prop..438m&link_type=abstract
NOAO Proposal ID #2008B-0438
Other
Scientific paper
The Sgr dwarf galaxy + tidal tail system, now extensively explored with 2MASS M giants, provides a clear example of a Milky Way (MW) satellite in tidal disruption. But long considered the exception on this regard, Sgr might prove to be a paradigm for at least some other dSph galaxies since recent studies suggest that the Leo I and Carina dSphs are also currently undergoing tidal stripping. Like Sgr and Leo I, Carina shows a flat/rising velocity dispersion, σ_v, from the core out to ~2.5× its King radius (r_lim). Our models of a significantly tidally disrupting, dark matter-dominated dSph can fit the observed morphology and dynamics of the Carina dSph and we have spectroscopically confirmed numerous Carina stars out to 9r_lim; these stars clearly outline a linear, tidal tail-like structure. Here, we propose to continue our spectroscopic survey of Carina to 10-12r_lim. Any Carina stars found at these radii have to be tidal debris (to have them bound to the satellite it would require Carina to have >10% the mass of the MW). As has been shown with, e.g., Sgr and Pal 5, the variation of the radial velocities over a large range of the tidal tails provides a strong constraint on the orbit of the satellite, and helps constrain both the mass of the satellite and the potential of the MW at the distance of Carina (100 kpc). In addition, our spectroscopic surveys in the Carina area have resulted in the discovery of numerous LMC stars out to ~26° from the LMC center, suggesting that the outer edge of this satellite has not yet been reached.
Carlin Jeffrey L.
Johnston Kathryn V.
Kunkel William E.
Majewski Steven R.
Munoz Ricardo R.
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