Outflows from Accreting Black Holes in Active Galactic Nuclei

活动星系核中吸积黑洞的流出

基本信息

批准号：
9876887
负责人：
Mitchell Begelman
金额：
$ 32.39万
依托单位：
University of Colorado at Boulder
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
1999
资助国家：
美国
起止时间：
1999-09-01 至 2003-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9876887&HistoricalAwards=false
关键词：
Outflows Accreting Black Holes Active

项目摘要

Powerful winds and jets are among the most dramatic manifestations of accreting black holes in active galactic nuclei (AGN). Recent consideration of the energetics of accretion flows suggests that such outflows are not only inevitable, but that the mass loss may be so strong that all but a tiny fraction of the supplied matter is expelled before it reaches the black hole. This project studies the theoretical ramifications and observational consequences of this new view of accretion in AGN. Although the loss of mass, angular momentum, and energy are interrelated in a predictable way, the specifics of the outflows depend on microphysical details. Dr. Begelman is constructing "inflow-outflow" models, calculating their radiative properties, and studying their relationships to the production and collimation of relativistic jets as well as their interactions with the AGN environment.The relativistic jets in AGNs may be one consequence of powerful mass loss from the inner parts of accretion flows, but the jets could also derive much of their energy from the spin of the black hole. Dr. Begelman is also studying how the extraction of spin energy via the Blandford-Znajek effect depends on the black hole's accretion history and its current environment. Dr. Begelman is also studying the braod z-ray iron lines and relativistic "diskoseismology" - the study of trapped oscillations in the inner regions of accretions disks - as observational probes of strong gravity regions close to black holes. ***

强大的风和喷射是活动星系核（AGN）中黑洞吸积的最引人注目的表现之一。最近对吸积流能量学的考虑表明，这种流出不仅是不可避免的，而且质量损失可能非常强烈，以至于所提供的物质在到达黑洞之前除了一小部分之外都被排出了。该项目研究活动星系核吸积这一新观点的理论影响和观测结果。尽管质量、角动量和能量的损失以可预测的方式相互关联，但流出的具体情况取决于微观物理细节。 Begelman 博士正在构建“流入-流出”模型，计算它们的辐射特性，并研究它们与相对论性喷流的产生和准直的关系以及它们与活动星系核环境的相互作用。活动星系核中的相对论性喷流可能是强大的辐射的结果之一。吸积流内部的质量损失，但喷流也可以从黑洞的旋转中获得大部分能量。贝格尔曼博士还在研究通过布兰德福德-兹纳耶克效应提取自旋能如何取决于黑洞的吸积历史及其当前环境。贝格曼博士还在研究布劳德 z 射线铁谱线和相对论性“盘震学”（吸积盘内部区域的俘获振荡研究），作为靠近黑洞的强重力区域的观测探测器。 ***