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arXiv 2102.01134astro-ph.GA
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杆的性质如何影响诱导螺旋结构

How the bar properties affect the induced spiral structure

L. Garma-Oehmichen, L. Martinez-Medina, H. Hernández-Toledo, I. Puerari

摘要:

恒星棒和旋臂共存,并共同发展,在大多数盘星系在本地宇宙。然而,这种相互作用的物理性质仍然是一个有争议的问题。在这项工作中,我们提出了一套数值模拟的基础上孤立的星系模型,旨在探讨如何酒吧属性影响诱导螺旋结构。我们涵盖了杆的属性,包括杆的长度,轴比,质量和旋转速率的大组合。我们使用三个银河系模型描述星系上升,平坦和下降的旋转曲线。我们发现,螺距角最好的相关性与酒吧模式的速度和螺旋振幅与酒吧四极矩。我们的研究结果表明,具有下降的旋转曲线的星系是最有效的形成大设计的螺旋结构,证明了具有较大的振幅和螺距角的螺旋。我们还测试了模拟的一个子集中的速度椭球的影响。我们发现,当我们增加径向各向异性,螺旋增加他们的螺距角,但变得不相干较小的振幅。

英文摘要:

Stellar bars and spiral arms co-exist and co-evolve in most disc galaxies in the local Universe. However, the physical nature of this interaction remains a matter of debate. In this work, we present a set of numerical simulations based on isolated galactic models aimed to explore how the bar properties affect the induced spiral structure. We cover a large combination of bar properties, including the bar length, axial ratio, mass and rotation rate. We use three galactic models describing galaxies with rising, flat and declining rotation curves. We found that the pitch angle best correlates with the bar pattern speed and the spiral amplitude with the bar quadrupole moment. Our results suggest that galaxies with declining rotation curves are the most efficient forming grand design spiral structure, evidenced by spirals with larger amplitude and pitch angle. We also test the effects of the velocity ellipsoid in a subset of simulations. We found that as we increase the radial anisotropy, spirals increase their pitch angle but become less coherent with smaller amplitude.

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