When the Fermi Gamma-Ray Space Telescope entered low-Earth orbit in 2008, it opened our eyes to a whole new Universe of high-energy radiation.
While Sagittarius A* may be quiet now, that hasn't necessarily always been the case. Look hard enough, and relics of past activity, such as the Fermi bubbles, can be found lurking in the space around the galactic plane. By studying these relics we can understand when and how that activity took place.X-ray satellite, jointly operated by NASA and the Japanese Space Agency .
The most likely scenario, he found, is a black hole wind blowing at a speed of 1,000 kilometers per second from a past feeding event that was metered out over the course of 10 million years and ended fairly recently. As the wind propagates outwards, the charged particles collide with the interstellar medium, producing a shock wave that bounces back into the bubble. These reverse shock waves heat the material inside the bubbles, causing it to glow.
The numerical simulations developed by Fujita accurately reproduced the temperature profile of the X-ray structure. He also investigated the possibility of a single explosive eruption from the galactic center and was unable to reproduce the Fermi bubbles. This suggests that a slow, steady wind from the galactic center was the most likely progenitor of the mysterious structures. And the power of the wind can only be attributed to Sagittarius A*, not star formation – another phenomenon that produces cosmic winds.
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