arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2002.06231astro-ph.GA
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棒的轨道内容:"non-x1-tree"的起源,棒支撑轨道

The orbital content of bars: The origin of 'non-x1-tree', bar-supporting orbits

P. A. Patsis, E. Athanassoula

摘要:

最近,在棒星系势中的许多轨道研究揭示了不被困在x1树轨道周围的轨道的存在,但可能是潜在的合适的积木酒吧。这些发现质疑x1家族作为银河棒轨道运动标准范例的独特性。本文的主要目标是调查的作用,这样的轨道可以发挥在塑造酒吧的形态。我们跟踪的形态图案出现在这些研究中提出的非周期性轨道的正面和边缘的意见,我们表明,他们在系统中引入的第二类分叉的x1。为了这个目的,我们使用一个典型的3D费勒斯酒吧模型,并按照径向和垂直分叉的x1家庭被认为是多周期的,与多= 2,3,5。x~1在多个= 2、3情形下的稳定性指数的变化也分别给出了四周期轨道和六周期轨道。我们将这些轨道制成表格,包括评估其作为适当构建块的作用所需的所有信息。我们讨论了它们的稳定性和它们的程度,以及它们的大小和形态演变,作为能量的函数。我们的结论是,即使是最重要的多周期轨道表2至5中提出的是不太合适的积木酒吧比家庭的x1树在相同的能量。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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