hierarchical mergers

Consecutive black-hole mergers in dense environments can build heavier remnants and drive fast spins.

Articles about hierarchical mergers

Space
Three Supermassive Black Holes Merging

Three Supermassive Black Holes Merging
Astronomers have identified a rare triple supermassive black hole system in the nearby galaxy NGC 6240, revealing three nuclei packed inside a kiloparsec and offering a new route …