In this thread, Space Tiger mentioned the Tully-Fisher relationship for spirals, and the Faber-Jackson relationship, "part of the fundamental plane of elliptical galaxies". Does anyone know of a review article on the extent to which these apply, to all spirals, all ellipticals, etc? A related question: in terms of systematic properties, of any kind, do dwarfs, LSBs, or irregulars have relationships too? For example, do dwarf ellipticals and dwarf spirals 'obey' the same relationships as their normal (or giant) brethren? Are LSBs 'merely' faint spirals (that otherwise sit somewhere on the TFR)?