These ultra-high energy gamma rays do not point to known low energy gamma ray sources, but diffuse on the silver disk (the projection of the Milky way in the sky).
In the process of propagation, high-energy cosmic rays collide with interstellar medium to produce high-energy gamma rays whose energy is about one tenth of the energy of the parent particle of cosmic rays.
It is worth mentioning that on March 2 this year,
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