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arXiv 2405.09503astro-ph.GA
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利用动态势场对银河系结构进行自洽建模

Self-consistent modelling of the Milky Way structure using live potentials

Eva Durán-Camacho, Ana Duarte-Cabral, Alex R. Pettitt, Robin G. Treß, Paul C. Clark, Ralf S. Klessen, Kamran R. J. Bogue, Rowan J. Smith, Mattia C. Sormani

AI总结:

本文开发了15个银河系型自洽动力学模型,通过与CO和HI观测对比,识别出能再现银河系主要结构的最佳模型,揭示了棒、旋臂及径向运动的复杂特征,为研究星际介质循环提供基础。

摘要:

为了推进我们对银河系星际介质演化的理解,银河系型星系的数值模型被广泛使用。然而,大多数模型仅粗略地类似于银河系(例如在总质量上),并且通常使用外加的解析势场(这些势场无法动力学演化)。这在断言它们适用于解释我们自身星系的观测时造成了问题。本工作的目标是确定一个数值模型,该模型不仅是银河系型星系,而且能够使用动力学演化的势场来模拟我们星系的一些主要观测结构,从而使其可以作为研究类似我们自身星系中星际介质循环的基础模型。本文介绍了一套使用AREPO数值代码开发的15个银河系型星系模型,通过与12CO和HI发射的银经-速度图进行银河系观测对比,从中提取并比较主要星系特征的骨架和终端气体速度。我们发现,在整体结构上拟合最佳的模型也再现了银河系的一些更具体的观测特征,包括一个模式速度为30.0 ± 0.2 km s⁻¹ kpc⁻¹的棒,棒半长为3.2 ± 0.8 kpc。我们的模型显示出旋臂周围的大尺度流运动,以及远超内棒区域的强径向运动。该模型突显了动力学银河系型星系的复杂运动,并有潜力为我们的星系如何调节星际介质和恒星形成提供有价值的见解。

英文摘要:

To advance our understanding of the evolution of the interstellar medium (ISM) of our Galaxy, numerical models of Milky Way (MW) type galaxies are widely used. However, most models only vaguely resemble the MW (e.g. in total mass), and often use imposed analytic potentials (which cannot evolve dynamically). This poses a problem in asserting their applicability for the interpretation of observations of our own Galaxy. The goal of this work is to identify a numerical model that is not only a MW-type galaxy, but one that can mimic some of the main observed structures of our Galaxy, using dynamically evolving potentials, so that it can be used as a base model to study the ISM cycle in a galaxy like our own. This paper introduces a suite of 15 MW-type galaxy models developed using the {\sc arepo} numerical code, that are compared to Galactic observations of $^{12}$CO and \ion{H}{I} emission via longitude-velocity plots, from where we extract and compare the skeletons of major galactic features and the terminal gas velocities. We found that our best-fitting model to the overall structure, also reproduces some of the more specific observed features of the MW, including a bar with a pattern speed of $30.0 \pm 0.2$ km\,s$^{-1}$\,kpc$^{-1}$, a bar half-length of $3.2 \pm 0.8$\,kpc. Our model shows large streaming motions around spiral arms, and strong radial motions well beyond the inner bar. This model highlights the complex motions of a dynamic MW-type galaxy and has the potential to offer valuable insight into how our Galaxy regulates the ISM and star formation.

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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