论文标题
轨道的轨道含量：“非X1-Tree”的起源，杆支持轨道
The orbital content of bars: The origin of 'non-x1-tree', bar-supporting orbits
论文作者
论文摘要
最近，许多在禁止的星系电位的轨道研究表明，存在未捕获在X1树轨道周围的轨道，但可能是条形杆的合适构件。这些发现质疑X1家族的独特性是银河条中轨道运动的标准范式。本文的主要目的是研究这种轨道在塑造条形图中可能扮演的角色。我们追踪这些研究中提出的非周期轨道的面对面和边缘视图中出现的形态模式，我们表明它们是通过X1的第二类分叉在系统中引入的。为此，我们使用典型的3D Ferrers杆模型，并遵循被认为是多周期性的X1家族的径向和垂直分叉，其中Multi = 2，3，5。X1在Multi = 2，3情况下的稳定性指数的变化分别为我们提供了四个周期性和六个周期性的Orbits。我们将这些轨道制成表格，包括所有必要的信息，以评估其角色作为适当的构件。我们讨论了它们的稳定性及其程度，以及它们的大小和形态进化，作为能量的函数。我们得出的结论是，即使表2到5中呈现的最重要的多周期轨道中最重要的轨道也比在相同能量的X1树的家族中对条形的构建块不那么合适。
Recently, many orbital studies in barred galaxy potentials have revealed the existence of orbits which are not trapped around x1 tree orbits, but could be potentially appropriate building blocks for bars. These findings question the uniqueness of the x1 family as the standard paradigm of orbital motion in galactic bars. The main goal of this paper is to investigate the role that such orbits could play in shaping the morphology of bars. We trace the morphological patterns appearing in the face-on and edge-on views of the non-periodic orbits presented in these studies and we show that they are introduced in the system by second type bifurcations of x1. For this purpose, we use a typical 3D Ferrers bar model and follow the radial and vertical bifurcations of the x1 family considered as being multi periodic, with multi = 2, 3, 5. The variation of the stability indices of x1 in the multi = 2, 3 cases give us also the four- and six- periodic orbits, respectively. We tabulate these orbits including all information necessary to assess their role as appropriate building blocks. We discuss their stability and their extent, as well as their size and morphological evolution, as a function of energy. We conclude that even the most important of the multi-periodic orbits presented in Tables 2 to 5 are less appropriate building blocks for bars than the families of the x1 tree at the same energy.
