Abstract
Black hole hot accretion flows occur in the regime of relatively low accretion rates and are operating in the nuclei of most of the galaxies in the universe. In this chapter, I will review one of the most important progresses in recent years in this field, which is about the wind or outflow. This progress is mainly attributed to the rapid development of numerical simulations of accretion flows, combined with observations on, e.g., Sgr A*, the supermassive black hole in the Galactic center. The following topics will be covered: theoretically why do we believe strong winds exist; where and how are they produced and accelerated; what are their main properties such as mass flux and terminal velocity; the comparison of the properties between wind and “disk-jet”; the main observational evidences for wind in Sgr A*; and one observational manifestation of the interaction between wind and interstellar medium, namely the formation of the Fermi bubbles in the Galactic center.
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- 1.
As we will introduce in the next paragraph, this assumption is likely true only when the magnetic field is not included in the analysis of the stability.
- 2.
In the calculations of many wind properties presented in Sadowski et al. [44] such as the mass flux of wind, they do the time-average first to the velocity field. Since wind is instantaneous, their result should be regarded as the lower limit.
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Acknowledgments
This project was supported in part by the National Basic Research Program of China (973 Program, grant 2014CB845800), the Strategic Priority Research Program The Emergence of Cosmological Structures of CAS (grant XDB09000000), the Natural Science Foundation of China (grants 11133005 and 11573051), and the CAS/SAFEA International Partnership Program for Creative Research Teams.
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Yuan, F. (2016). Winds from Black Hole Accretion Flows: Formation and Their Interaction with ISM. In: Bambi, C. (eds) Astrophysics of Black Holes. Astrophysics and Space Science Library, vol 440. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-52859-4_4
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