发稿时间:2019-12-02浏览次数:10

USTC Astronomy Seminar Series: 2019 Fall
Black Hole Accretion and Outflow
Amin Mosallanezhad  博士后
中国科学技术大学
2019/12/05, 4:00pm , the 19th-floor Observatory Hall
Accretion of gas through a disc onto a black hole is associated with many active phenomena in our universe such as active galactic nuclei (AGNs), X-ray binaries (XRBs), and extra galactic jets. Based on temperature, black hole accretion discs can be divided into two distinct classes: hot and cold. Hot accretion flow consists of optically thin, and geometrically thick disc with very low mass accretion rate. Hot accretion flow is very common in the universe, ranging from low-luminosity active galactic nuclei (LLAGNs), which is the majority of nearby galaxies, to the quiescent and hard states of black hole X-ray binaries. On the other hand, the thin disk and slim disk models belong to the class of cold accretion flows and both consist of optically thick gas. One of the most interesting topics in recent years in this field is wind (often called outflow). Wind is not only a fundamental aspect of accretion flow, but also plays an important role in AGN feedback, since wind can suppress the star formation and black hole growth effectively.
 Dr. Amin Mosallanezhad is currently a postdoctoral fellow in the Astronomy Department at University of Science and Technology of China (USTC) hosting by Prof. Ye-Fei Yuan. He got my PhD degrees in astronomy and astrophysics from Shanghai Astronomical Observatory (SHAO) under the supervision of Prof. Feng Yuan. His main research interests are largely focused on black hole accretion and AGN feedback. He is interested in the effects of wind/outflow on the structure and evolution of both hot and cold accretion flows in analytical aspects as well as numerical simulations.