The role of failed accretion disk winds in active galactic nuclei

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Giustini, Margherita., Proga, Daniel. 2021. The role of failed accretion disk winds in active galactic nuclei. Proceedings of the International Astronomical Union 15, S356, 82-86. https://doi.org/10.1017/S1743921320002628

Both observational and theoretical evidence point at outflows originating from accretion disks as fundamental ingredients of active galactic nuclei (AGN). These outflows can have more than one component, for example an unbound supersonic wind and a failed wind (FW). The latter is a prediction of the simulations of radiation-driven disk outflows which show that the former is accompanied by an inner failed component, where the flow struggles to escape from the strong gravitational pull of the supermassive black hole. This FW component could provide a physical framework to interpret various phenomenological components of AGN. Here we briefly discuss a few of them: the broad line region, the X-ray obscurer, and the X-ray corona.

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