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学术报告(20170918)Modeling the Astrophysical Jets/Lobes
发布时间:2017-09-13

 

报告题目: Modeling the Astrophysical Jets/Lobes
报告人: 李晖
报告人单位: 美国 洛斯阿拉莫斯国家实验室(LANL)
报告时间: 2017年9月18日上午10:00
报告地点: 东七楼,427室(四楼)
报告摘要:  
  Observations of several high-energy astrophysical systems have emphasized the important role of magnetic fields in the magnetically dominated outflows, including powerful jets from Active Galactic Nuclei (AGNs), pulsar winds and possibly gamma-ray bursts. We will present three-dimensional relativistic MHD simulations of magnetic tower configuration as a model for magnetically dominated outflows driven by accreting black holes.  We will discuss their stability and energy conversion processes (from magnetically dominated regime to kinetic energy). The role of current driven instabilities will be discussed in detail. Furthermore, we will present large-scale particle-in-cell simulations of relativistic reconnection to examine the magnetic energy dissipation processes and the associated particle acceleration processes. We show that the relativistic flows generated by reconnection can give rise to a first-order Fermi-like acceleration that operates very efficiently in highly magnetically dominated limit. Implications for observations of AGN jets and GRBs will be discussed as well.
报告人简介:  
  1990年本科毕业于北京大学物理系;1995年在美国莱斯大学获博士学位;2000年开始为洛斯阿拉莫斯国家实验室成员。莱斯大学物理与天文系兼职教授,AAS和APS会员,主要研究领域为致密天体环境中磁化等离子体的物理及数值模拟。

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