) produced when accretion flows around black holes (or neutron stars) are irradiated by hard X-rays.
Based on the search results, "FE Black Hole" refers to two entirely different topics: scientific astrophysics and Roblox game exploits. Definition: The Fe K line is a strong X-ray emission line (around FE Black Hole
concerning iron emission lines around black holes? ) produced when accretion flows around black holes