On the wave excitation and a generalized torque formula for Lindblad resonances excited by external potential
On the wave excitation and a generalized torque formula for Lindblad resonances excited by external potential
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外部电势激发的 Lindblad 共振的波激励和广义扭矩公式
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
P. Artymowicz
中科院分区：
文献类型：
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作者：
P. Artymowicz
现有的用外加引力势激发二维气体圆盘中密度波的理论所作的近似，妨碍了对Lindblad共振相对于满足轨道公度要求的半径的有效位置的移动的直接解析描述，以及在大方位数m的微扰势模式下产生的所谓的力矩截止。这两种现象都与作用在气体上的方位力有关，在过去常用的WKB近似中被忽略了。我们在必要的地方扩展了以前的Lindblad共振理论，以便对问题进行一致的分析处理，特别是对于大的m
The existing theory of density wave excitation in two-dimensional gaseous disks by imposed gravitational potentials makes approximations which prevent a direct analytical description of the shifts in effective positions of Lindblad resonances with respect to radii satisfying orbital commensurability requirement, and of the so-called torque cutoff arising at large azimuthal numbers m of the perturbing potential's pattern. Both phenomena are related to the azimuthal forces acting on gas, neglected in the WKB approximation commonly used in the past. We extend previous theories of Lindblad resonance wherever necessary for a consistent analytical treatment of the problem, particularly for large m