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Black hole accretion flows are accompanied by outflows, including wind and jet. In the first part of my talk, I will talk about wind launched from hot accretion flows, including: 1) why we think wind must exist; 2) physical properties of winds such as mass flux and velocity; 3) acceleration mechanism; 4) comparison between jet and wind; and 5) observational evidences. In the second part of my talk, I will focus on the episodic jet and the associated flares. Such kind of phenomena are widely observed in black hole sources such as Sgr A* and M87. In some cases, the ejection speed is measured and some periodicity is found. I will introduce our MHD model for the ejection and flares, explaining how reconnection produces flares and flux ropes and how these flux ropes are ejected out.
Prof. Feng Yuan got his PHD in 1997 from University of Science and Technology of China. He then worked in Nanjing University, Max-Planck Institute of Radio Astronomy, Harvard University, and Purdue University as a postdoc before he moved back to China in 2005 and works in Shanghai Astronomical Observatory since then. Now he serves as the deputy director of Shanghai Astronomical Observatory and has joint appointments in several universities such as Peking University and USTC. His main research interests are black hole astrophysics and galaxy evolution. So far he has published over 100 papers in refereed journals, including one review paper on black hole accretion in ARA&A. These papers have received over 10000 citations.