Figure 24-16: Dead Quasar Flare A star wandering too close to a supermassive black hole can provide temporary fuel for the dead quasar. Modeling indicates that this event in 2012, called Swift J1644+57, occurred around a black hole about twice the mass of the 4 million solar mass black hole at the center of our Milky Way Galaxy. The X-ray emission from this flare lost most of its initial intensity over a period of several months.
(NASA/Goddard Space Flight Center/Swift)