Evidence for a recoiling black hole has been found using data from Chandra (colored blue in this composite image), Hubble (gold), XMM-Newton, and several ground-based telescopes. This black hole kickback was caused either by a slingshot effect produced in a triple black hole system, or from the effects of gravitational waves produced after two supermassive black holes merged a few million years earlier. Of the 2,600 X-ray sources found in this survey, only CID-42 coincides with two very close, compact optical sources. In this image, the two sources are seen in the HST data, but they are too close for Chandra to resolve separately.
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