“THE INNER STRUCTURES of quasars (the accretion disk, the BLR, and the dust torus) are all within the sphere of influence of the SMBH, where the most important processes associated with accretion are occurring (e.g., winds and outflows, photoionization, chemical enrichment, dynamical evolution, etc.).” ( SMBH = supermassive black hole; BLR = broad emission line region).
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