X-ray 'Echoes' Probe Habitat of Monster Black Hole

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Astronomers using data from the European Space Agency’s XMM-Newton satellite have found a long-sought X-ray signal from NGC 4151, a galaxy that contains a supermassive black hole. When the black hole’s X-ray source flares, its accretion disk reflects the emission about half an hour later. The discovery promises a new way to unravel what’s happening in the neighborhood of these powerful objects.

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Wikimedia Commons, in Wikimedia Commons

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Public domain, as the Wikimedia Commons states it.

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Public domain

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NASA/Goddard Space Flight Center

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