论文标题
扰动的进攻椭圆形，作为带有两个图案速度的禁止的星系中的螺旋臂的组成部分
Perturbed precessing ellipses as the building blocks of spiral arms in a barred galaxy with two pattern speeds
论文作者
论文摘要
对禁止的螺旋星系的观测和模拟表明，通常，螺旋臂以与钢筋的模式速度不同。参考书目的主要结论是，钢筋的旋转速度比螺旋臂的旋转速度更快，其角速度的三重值甚至三重值。在解释具有两个图案速度的禁止的螺旋星系的情况下解释螺旋臂的形成的理论是流形理论，其中支持螺旋密度波的轨道是混乱的，并且与从Lagrangian Points L_1和L_2散发的歧管有关。在本研究中，我们考虑了一种替代方案，在与螺旋臂相比足够快地旋转的情况下，可以将棒电位视为螺旋电位的扰动。在这种情况下，支持螺旋密度波的稳定椭圆轨道（在大型设计星系中）被转化为具有一定厚度的准膜轨道（或2D Tori）。这些扰动的甲板在所有能量水平上的叠加都会产生略微扰动的对称螺旋密度波。
Observations and simulations of barred spiral galaxies have shown that, in general, the spiral arms rotate at a different pattern speed to that of the bar. The main conclusion from the bibliography is that the bar rotates faster than the spiral arms with a double or even a triple value of angular velocity. The theory that prevails in explaining the formation of the spiral arms in the case of a barred spiral galaxy with two pattern speeds is the manifold theory, where the orbits that support the spiral density wave are chaotic, and are related to the manifolds emanating from the Lagrangian points L_1 and L_2 at the end of the bar. In the present study, we consider an alternative scenario in the case where the bar rotates fast enough in comparison with the spiral arms and the bar potential can be considered as a perturbation of the spiral potential. In this case, the stable elliptical orbits that support the spiral density wave (in the case of grand design galaxies) are transformed into quasiperiodic orbits (or 2D tori) with a certain thickness. The superposition of these perturbed preccesing ellipses for all the energy levels of the Hamiltonian creates a slightly perturbed symmetrical spiral density wave.
