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銀河中心の巨大ブラックホールのまわりのガス円盤の進化

星系中心大质量黑洞周围气盘的演化

基本信息

批准号：
07640344
负责人：
HABE Asao
金额：
$ 1.34万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07640344/
关键词：
massive black hole galactic center AGN gas disk SPH bar resonace mass accretion mass accretion massire Black hole gao disk resonance

项目摘要

When a central massive black hole exists in a galaxy, the additional inner Lindblad resonance (ILR) exists inside the usual ILR.We call this resonance as the nuclear Lindblad resonance. We study the gas dynamics in a weakly barred potential with a massive black hole by using 2D numerical simulations in order to investigate the effect of the nuclear Lindblad resonance caused by a central massive black hole in a galaxy, and to clarify a role of the nuclear Lindblad resonance in triggering the gas fueling to nuclear starburst regions or AGNs.Our numerical results show that strong trailing spiral shocks are formed in the nuclear Lindblad resonance region and the gas in the shock region is rapidly fueled into central region and make a nuclear gas ring. As a results, a large amount of the gas concentrates in the nuclear region beyond the ILR radius in a dynamical time scale and a gas ring is formed. During the gas accumulation process, the strong shocks are created. These strong shocks can trigger burst star formations.The size occupied by gas before accumulation depends on the mass of black hole or pattern speed of bar. We study the linear stability of the finally formed gas ring and find that the the gas ring is easy to be gravitational unstable. In this case, we can expect fragmentation of the gas ring and further concentration of gas into the black hole.

当星系中存在中心大质量黑洞时，通常的ILR内部会存在额外的内部林德布拉德共振（ILR）。我们将这种共振称为核林德布拉德共振。我们通过二维数值模拟研究了大质量黑洞弱束缚势中的气体动力学，以研究星系中心大质量黑洞引起的核林德布拉德共振的影响，并阐明核林德布拉德共振在触发核星暴区域或活动星系核的气体燃料中的作用。我们的数值结果表明，在核林德布拉德中形成了强尾随螺旋激波共振区和激波区的气体被迅速注入中心区并形成核气环。结果，在动力学时间尺度上，大量气体集中在ILR半径之外的核区，形成气环。天然气成藏过程中会产生强烈的冲击。这些强烈的冲击可以引发爆发恒星的形成。气体在积累之前所占据的大小取决于黑洞的质量或条形的速度。我们研究了最终形成的气环的线性稳定性，发现气环很容易出现重力不稳定。在这种情况下，我们可以预期气环会破碎，气体会进一步集中到黑洞中。