A scientist from Tokyo Metropolitan University has shown that large gamma-ray-emitting bubbles around the center of the Milky Way were produced by fast, outward-blowing winds and an associated “reverse shock.” Numerical simulations successfully reproduced the temperature profile observed by an X-ray telescope. Such outflows have been observed in other galaxies; this finding suggests similar winds may have been blowing in our own galaxy until quite recently.
Click here for original story, Mysterious gamma-ray emitting bubbles around the center of the Milky Way explained
Source: Phys.org