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Interaction between galaxies move gas to the central kiloparsec via bars or spiral arms; from there, inflows along nuclear spirals and compact disks transfer gas to the dusty torus, that feeds the accretion disk, that feeds de Supermassive Black Hole (Source: Storchi-Bergmann & Schnorr-Müller 2019, Nature Astronomy).
Mass density distribution (comoving 15 Mpc side, dominated by dark matter) when the Universe had 5% of its present age and the first galaxies, black holes and stars were forming. Credit: Rainer Weinberger (IllustrisTNG Collaboration) for his contribution to the IAU Symposium 359, that we are editing (Thaisa Storchi-Bergmann, William Forman, Roderik Overzier and Rogério Riffel).
In a paper recently accepted for publication (Hekatelyne Carpes et al.), we have shown that one more OH Megamaser galaxy shows a recently triggered active nucleus:
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