Recipe to feed a Supermassive Black Hole

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).