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Mellow supermassive black holes act as major factories of high-energy cosmic particles
High energetic cosmic particles such as x-rays, gamma rays, and neutrinos are believed to be created by powerful cosmic-ray accelerators or surrounding environments in the Universe. Yet, their origins remain unknown. Active supermassive black holes are believed to act as Active galactic nuclei (AGN), the most promising emitters of high-energy gamma rays and neutrinos. But,…