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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