禁止电位下的气流- III。改变四极杆的效果
Gas flow in barred potentials - III. Effects of varying the Quadrupole
摘要：
我们运行流体动力学模拟的二维等温非自引力无粘气体流动在一个刚性旋转的外部施加的电位形成的只有两个组件：一个四极杆和一个四极杆。我们系统地探讨了改变四极而保持固定的四极的影响，并讨论了银河系中的速度图的解释的后果。我们发现，气流可以约束势的四极矩和产生势的杆的特性，杆的指数标度长度至少为$1.5\rm\, kpc$。杆的强度也受到约束。我们的整体解释倾向于模式速度为$Ω=40\,\rm km s^{-1} {kpc}^{-1}$。我们发现，对于大多数观测功能，存在一个值的参数，匹配每个单独的功能很好，但很难再现所有的重要功能一次。由于在一般问题中涉及的参数数量非常多，因此需要能够在参数空间中运行自动搜索的定量拟合方法。
英文摘要：
We run hydrodynamical simulations of a 2D isothermal non self-gravitating inviscid gas flowing in a rigidly rotating externally imposed potential formed by only two components: a monopole and a quadrupole. We explore systematically the effects of varying the quadrupole while keeping fixed the monopole and discuss the consequences for the interpretation of longitude-velocity diagrams in the Milky Way. We find that the gas flow can constrain the quadrupole of the potential and the characteristics of the bar that generates it. The exponential scale length of the bar must be at least $1.5\rm\, kpc$. The strength of the bar is also constrained. Our global interpretation favours a pattern speed of $Ω=40\,\rm km s^{-1} {kpc}^{-1}$. We find that for most observational features, there exist a value of the parameters that matches each individual feature well, but is difficult to reproduce all the important features at once. Due to the intractably high number of parameters involved in the general problem, quantitative fitting methods that can run automatic searches in parameter space are necessary.
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