Group 7 Galaxies And Black Holes

The Chandra X-Ray Observatory announced that it’s observed something unprecedented: a supermassive black hole being ejected from its own galaxy at speeds of millions of miles per hour. The evidence suggests that the ejection was caused when the black hole collided with the supermassive black hole of another galaxy, producing an immense recoil force.

“It’s hard to believe that a supermassive black hole weighing millions of times the mass of the sun could be moved at all, let alone kicked out of a galaxy at enormous speed,” said study leader Francesca Civano in a press release. “But these new data support the idea that gravitational waves — ripples in the fabric of space first predicted by Albert Einstein but never detected directly — can exert an extremely powerful force.”

The ejection of the black hole actually took place about 4 billion years ago, as astronomers observe the radiation from galaxy CID-42, which is 4 billion light years from Earth. Astronomers reviewing data from the Hubble Telescope first noticed something interesting was going on. The visual data was then confirmed by telescopes on the ground.

“The previous data told us that there was something special going on, but we couldn’t tell if there were two black holes or just one,” said study co-author Martin Elvis. “We needed new X-ray data to separate the sources.”

There are two other possible explanations for the visual data, involving either the collision of three supermassive black holes or two supermassive black holes spiralling towards one another. Neither seems nearly as likely, though, as it would mean that one X-ray signature was being obscured, and there’s little evidence of that.)

One of the most fascinating – and potentially terrifying – things about this discovery is that it implies that there may be supermassive black holes moving through the universe outside of galaxies. And we currently have no way of knowing that they’re there.

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