New home for runaway black hole

Galactic ejection may have sent cosmic wanderer through deep space

By Andrew Grant, 15:27 PM February 22, 2013

The most massive black hole ever measured may be an intergalactic hitchhiker that escaped from one galaxy before getting captured by another. If this scenario, laid out in a paper posted February 18 at, is proven correct, it would be the first time astronomers have definitively spotted a black hole that was expelled from its original galactic home.

Computer simulations of galaxy mergers suggest that some supermassive black holes can be nomads: When the galaxies’ central black hole...

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