- NGC 5139 (Omega Centauri) - An image, links, data, and discussion from SEDS.
- Omega Centauri - a former nucleus of a dissolved dwarf galaxy? - A technical article from the Los Alamos E-print archive
- Omega Centauri: Nucleus of a Milky Way Dwarf Spheroidal? - A 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.
