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arXiv 2407.07151astro-ph.GA
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作为银河系结构动力学探针的受扰动宽双星

Disrupted Wide Binaries as Dynamical Probes of Galactic Structure

Tomer D. Yavetz

AI总结:

该研究通过模拟含旋转星系棒引力势中宽双星的演化,发现非轴对称结构引发的共振会改变受扰双星的间距分布,可借此定位棒共振并约束其图案速度与振幅,为银河系结构探测提供新的动力学方法。

摘要:

银河系中许多恒星形成于双星系统。其中最宽的双星最终会因途经恒星的冲击与银河系潮汐场的共同作用而受扰动瓦解。若银盘完全呈轴对称,来自受扰双星系统的恒星会沿近乎相同的轨道缓慢分离。我们研究了刚性旋转棒等非轴对称结构的存在会如何极大改变这一图景。具体而言,我们展示了由这些扰动引发的共振附近的轨道动力学,会如何在受扰双星间距分布中产生局部涨落。我们对嵌入含旋转星系棒的引力势中的宽双星系统演化进行了模拟,证明受扰双星分布中的特征与涨落可用于定位棒共振,并约束棒的图案速度与振幅。

英文摘要:

Many of the stars in the Galaxy were formed in binary systems. The widest of these can eventually become disrupted due to a combination of kicks from passing stars and the Galactic tidal field. If the Galactic disk were purely axisymmetric, the stars from a disrupted binary system would slowly drift apart on nearly identical orbits. We study how the existence of non-axisymmetric structures, such as a rigidly rotating bar, can greatly alter this picture. In particular, we show how the orbital dynamics near the resonances sourced by these perturbations can create local fluctuations in the distribution of disrupted binary separations. We simulate the evolution of wide binary systems embedded in gravitational potentials with rotating galactic bars, and show how features and fluctuations in the distribution of disrupted binaries can be used to locate bar resonances and constrain the bar's pattern speed and amplitude.

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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