Kavli Affiliate: Feng Yuan
| First 5 Authors: Hai Yang, Feng Yuan, , ,
| Summary:
Wind is believed to be widespread in various black hole accretion flows.
However, unlike the wind from thin disks, which have substantial observational
evidence, the wind from hot accretion flows is difficult to observe due to the
extremely high temperatures causing the gas to be almost fully ionized. Its
existence was controversial until recent theoretical work demonstrated its
presence and strength, which was subsequently confirmed by observations.
Although there have been some new observations recently, the main progress
still comes from theoretical studies. These studies investigate the effects of
different magnetic fields and black hole spins on the wind, providing insights
into properties such as mass flux and wind velocity. Wind is typically produced
locally within the Bondi radius, and even wind generated on a small scale can
propagate far beyond this radius. The situation with super-Eddington wind is
similar, despite some recent observations, the main advances rely on
theoretical studies. Recent research comparing the momentum and energy of wind
and jets suggests that wind plays a more crucial role in active galactic nuclei
feedback than jets, whether the wind originates from hot accretion flows or
super-Eddington accretion flows.
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