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Omega Centauri: Nucleus of a Milky Way Dwarf Spheroidal?
http://arxiv.org/abs/astro-ph/9910278A technical article from the Los Alamos E-print archive that discusses the possibility that Omega Centauri could be the remains (nucleus) of a once larger satellite dwarf galaxy that has been substantially reduced by tidal stripping caused by the Milky Way's disk.
Submitted in section: Astronomy: Star Clusters: Globular Clusters: Omega Centauri: Omega Centauri: Nucleus of a Milky Way Dwarf Spheroidal?