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Traces of Past Activity in the Galactic Centre

Morris, Mark R.; Goldwurm, Andrea; Ponti, Gabriele +1 more

The Milky Way centre hosts a supermassive Black Hole (BH) with a mass of ∼ 4 × 1{0}⁶ M_{⊙}. Sgr A^∗, its electromagnetic counterpart, currently appears as an extremely weak source with a luminosity L∼10^-9L_Edd. The lowest known Eddington ratio BH. However, it was not always so; traces of "glorious" active …