Arp 299: Black Holes in Colliding Galaxies

Explanation: Is only one black hole spewing high energy radiation -- or two? To help find out , astronomers trained NASA 's Earth-orbiting NuSTAR and Chandra telescopes on Arp 299 , the enigmatic colliding galaxies expelling the radiation. The two galaxies of Arp 299 have been locked in a gravitational combat for millions of years, while their central black holes will soon do battle themselves. Featured , the high-resolution visible-light image was taken by Hubble , while the superposed diffuse glow of X-ray light was imaged by NuSTAR and shown in false-color red, green, and blue. NuSTAR observations show that only one of the central black holes is seen fighting its way through a region of gas and dust -- and so absorbing matter and emitting X-rays. The energetic radiation, coming only from the galaxy center on the right, is surely created nearby -- but outside -- the central black hole 's event horizon . In a billion years or so, only one composite galaxy will remain, and only one central supermassive black hole . Soon thereafter, though, another galaxy may enter the fray.

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