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Nuclear Activity at z = 0: Insights on Accretion Flows and Jet Formation
主讲人 主持人
时间 2014-11-12 17:05:05 报告题目
首作者 People
职称 联系电话
邮箱 研究方向
主讲人简介 地点
办公室 研究院 KIAA
日期: 
2014/11/12        
People: 
Luis Ho
Institute: 
KIAA

摘要:

A significant fraction of nearby galaxies show evidence of weak nuclear activity unrelated to normal stellar processes. High-resolution, multiwavelength observations indicate that the bulk of this activity derives from black hole accretion with a wide range of accretion rates. The low accretion rates that typify most low-luminosity active galactic nuclei induce significant modifications to their central engine. The broad-line region and obscuring torus disappear in some of the faintest sources, and the optically thick accretion disk transforms to a three-component structure consisting of an inner radiatively inefficient accretion flow, a truncated outer thin disk, and a jet or outflow. The local census of nuclear activity supports the notion that most, perhaps all, bulges host a central supermassive black hole, although the existence of active nuclei in at least some late-type and dwarf galaxies suggests that a classical bulge is not a prerequisite to seed a nuclear black hole.