Hi. Can anyone explain the difference between a Globular Cluster and a Dwarf Elliptical Galaxy?

Question

Is it size or maybe the clusters position in the halo...as "part" of a galaxy , that it's subject to the galaxies gravity? Or is it something more?

Answer 1

A globular cluster should have formed from a single cloud of gas, but within a galaxy.  A dwarf should form outside any other galaxy, and should be bigger, but there's no guarantee.  And there's plenty of discussion that if you can't tell the difference, there isn't any.  For example, is Omega Centauri the core of an elliptical, or a really big globular?  The study of some stars in it suggests that it's the core of an elliptical.

Answer 2

Here is the "bridge" between them: