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

当星系中存在中心大质量黑洞时，额外的内部林德布莱德共振（ILR）存在于通常的ILR内。我们称这种共振为核林德布莱德共振。为了研究星系中心大质量黑洞引起的核Lindblad共振对弱棒势中的气体动力学的影响，并阐明核Lindblad共振在触发核星爆区或agn的气体燃料中所起的作用，我们采用二维数值模拟的方法研究了含大质量黑洞的弱棒势中的气体动力学。数值计算结果表明，在核林德布莱德共振区形成了强烈的尾螺旋激波，激波区的气体迅速被燃料注入中心区域，形成核气环。结果，在动态时间尺度上，大量气体集中在超过ILR半径的核区，形成气环。在气体积聚过程中，会产生强烈的冲击。这些强烈的冲击可以引发恒星的爆发。气体在聚集前所占据的大小取决于黑洞的质量或条形速度。我们研究了最终形成的气环的线性稳定性，发现气环很容易发生引力不稳定。在这种情况下，我们可以预期气体环的破碎和气体进一步集中到黑洞中。

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.