A technique called echo mapping suggests supermassive black holes, like that at the heart of the Milky Way, are surrounded by clusters of dark matter.

Supermassive black holes may be surrounded by dark matter clusters, new 'echo map' technique suggests

Source: space
Source Link: https://www.space.com/astronomy/dark-universe/supermassive-black-holes-may-be-surrounded-by-dark-matter-clusters-new-echo-map-technique-suggests