A gamma-ray trickster has just been found in the vicinity of the Milky Way.
being a leading candidate – did so millions of years ago, and the bubbles have been blowing upwards and outwards ever since. They're brighter in high-energy gamma radiation than the rest of the Milky Way's disk.
The location of the cocoon is directly coincident with the location of another object – the core of Sagittarius dwarf spheroidal galaxy, a satellite of the Milky Way that is in the process of being torn apart and subsumed by the larger galaxy. If you see something emitting gamma radiation in a larger gamma radiation structure, it's probably natural to assume that the two are related. But two things with similar shape and orientations lining up directly in our line of sight would be, well, really peculiar.
They modeled the emission over a range of explanations, including the intra-bubble cocoon and the Sagittarius galaxy, and found that, by quite some significance, the Sagittarius galaxy was the most likely emitter of the gamma radiation in the Fermi cocoon. Nor have any massive, short-lived stars been dying in spectacular supernovae; these are born from gas, and, well. There is none.
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