Other
Scientific paper
Feb 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009noao.prop..423m&link_type=abstract
NOAO Proposal ID #2009A-0423
Other
Scientific paper
The Sagittarius (Sgr) dwarf galaxy+tidal tail system provides a clear example of a Milky Way (MW) satellite in tidal disruption. But is Sgr the exception or paradigm of dSph galaxies? Interesting clues suggest the latter: Other MW dSphs exhibit very extended surface brightness profiles and approximately flat velocity dispersion profiles, as does Sgr out into its tidal arms and as do N-body models of disrupting dSphs. But only in the Carina dSph have we found another clear set of tidal tails (Munoz et al. 2006,2008). Nevertheless, yet more tidally disrupting MW dSphs is a problem for CDM, which predicts that nearly all should have their luminous parts securely protected within dark matter cocoons. Thus, it is critical to determine if other dSphs sharing the structural and velocity patterns of Sgr and Carina at inner radii have tidal tails at larger radii. As with our successful Carina study, we made large MOSAIC maps around the Leo I (4.5 deg^2) and Ursa Minor (17 deg^2) dSphs to find tidal tails. While in both cases follow-up spectroscopy reveals numerous velocity dSph members beyond the King radius, definitive tails are not yet outlined. We propose to finish the Leo I and Ursa Minor studies, and determine whether CDM has a new problem on small scales (i.e. that there are too many tidally disrupting dSphs compared to expectations from (Lambda)CDM models).
Johnston Kathryn V.
Majewski Steven R.
Munoz Ricardo R.
Palma Christopher
Patterson Richard J.
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