1932

Abstract

Active galactic nuclei (AGNs) represent the growth phases of the supermassive black holes in the center of almost every galaxy. Powerful, highly ionized winds, with velocities ∼0.1–0.2, are a common feature in X-ray spectra of luminous AGNs, offering a plausible physical origin for the well-known connections between the hole and properties of its host. Observability constraints suggest that the winds must be episodic and detectable only for a few percent of their lifetimes. The most powerful wind feedback, establishing the relation, is probably not directly observable at all. The relation signals a global change in the nature of AGN feedback. At black hole masses below , feedback is confined to the immediate vicinity of the hole. At the mass, it becomes much more energetic and widespread and can drive away much of the bulge gas as a fast molecular outflow.

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/content/journals/10.1146/annurev-astro-082214-122316
2015-08-18
2024-12-14
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