The Effect of the Self-Gravity of Gas on Gas Fueling in a Barred Galaxy with a Supermassive Black Hole
The Effect of the Self-Gravity of Gas on Gas Fueling in a Barred Galaxy with a Supermassive Black Hole
复制标题
气体自重力对超大质量黑洞棒状星系气体燃料的影响
DOI：
10.1086/308233
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
K. Wada
中科院分区：
文献类型：
--
作者：
H. Fukuda;A. Habe;K. Wada
在我们以前的论文中，我们证明了在包含中心超大质量黑洞(SMBH)的禁止星系的核区中的气体盘由于SMBH引起的额外的内Lindblad共振而迅速演化为核气环。在这篇文章中，我们用二维流体力学模拟研究了包含气体自重的气环的命运。我们发现，当气体的表面密度超过临界值时，气环变得引力不稳定，并碎裂成几个气团。一些密度较大的团块通过周围气体的吸积和与其他团块的碰撞而增加质量，最终形成一个非常大的气团(M~107M☉)。由于来自大质量团块的扭矩，环中的部分气体失去了角动量，落到了银河系中心。结果，在SMBH周围形成了一个核气盘(R~50pC)。R<；50PC的吸积率在3.5年达到0.1M☉yr-1。在杆式燃料的最后阶段，自重对气体的角动量转移至关重要。这是一种向SMBH附近加注气体的新机制。
In our previous paper, we showed that a gas disk in the nuclear region of a barred galaxy that contains a central supermassive black hole (SMBH) rapidly evolves into a nuclear gas ring because of an additional inner Lindblad resonance caused by the SMBH. In this paper, we investigate the fate of the gas ring, which involves the self-gravity of gas, using two-dimensional hydrodynamical simulations. We find that the gas ring becomes gravitationally unstable for the surface density of the gas above a critical value and fragments into several gas clumps. Some denser clumps increase their mass via the accretion of the surrounding gas and collisions with other clumps, and finally a very massive gas clump (M ~ 107 M☉) is formed. Because of the torque from the massive clump, a part of the gas in the ring loses its angular momentum and falls into the galactic center. As a result, a nuclear gas disk (R ~ 50 pc) is formed around the SMBH. The accretion rate for R < 50 pc reaches about 0.1 M☉ yr-1 for 3.5 × 107 yr. At the final phase of the bar-driven fueling, self-gravity is crucial for the angular momentum transfer of the gas. This is a new mechanism for gas fueling to the vicinity of the SMBH.