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Dark globular cluster is a proposed type of globular star clusters that has an unusually high mass for the amount of stars within it. Proposed in 2015 on the basis of observational data, dark globular clusters are believed to be populated by objects with significant dark matter components, such as central massive black holes.
Observational data
The observational data for dark globular clusters comes from the Very Large Telescope (VLT) in Chile which observed the vicinity of the galaxy Centaurus A. Many of the globular clusters inside that galaxy are brighter and more massive than those orbiting the Milky Way and a sample of 125 globular clusters around Centaurus A was studied using the VLT's FLAMES instrument. While globular clusters are normally considered to be almost devoid of dark matter, the study of the dynamical properties of sampled clusters suggested the presence of exotically concentrated dark matter. The study was published in The Astrophysical Journal(link). The existence of dark globular clusters would suggest that their formation and evolution are markedly different from other globular clusters in Centaurus A and the Local Group.