Once you go rogue, you can't go back.
Supermassive black holes far from homethem at the center of their host galaxy, which means that if you wanted one to wander away, you'd need something very forceful to compel them to flee. In some cases, a collision with another galaxy can do the trick.
When two galaxies collide, the black holes in each can either merge into a single one, or be pushed around to travel across their respective galaxies. The researchers utilized the ROMULUS simulation, which involves large-scale cosmological simulations with resolution on par with the best resolution simulations of this sort conducted so far, to determine what would happen to supermassive black holes when they are kicked around.
In addition to the 10 percent figure, researchers also discovered in the simulations that galaxies with masses equivalent to our Milky Way galaxy had an average of 12 rogue supermassive black holes distant from the galactic center. "Wandering supermassive black holes in the ROMULUS simulations originate from the centers of destroyed infalling satellite galaxies," according to the research, which also predicts"a substantial wandering supermassive black hole population".
An image from the ROMULUS computer simulation showing the locations of"wandering" supermassive black holes. Source:
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