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arXiv 2203.01358astro-ph.GA
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WISDOM项目- X.星系中心分子ISM的形态及其对星系结构的依赖

WISDOM Project -- X. The morphology of the molecular ISM in galaxy centres and its dependence on galaxy structure

Timothy A. Davis, Jindra Gensior, Martin Bureau, Michele Cappellari, Woorak Choi, Jacob S. Elford, J. M. Diederik Kruijssen, Federico Lelli, Fu-Heng Liang, Liji… 展开作者

Timothy A. Davis, Jindra Gensior, Martin Bureau, Michele Cappellari, Woorak Choi, Jacob S. Elford, J. M. Diederik Kruijssen, Federico Lelli, Fu-Heng Liang, Lijie Liu, Ilaria Ruffa, Toshiki Saito, Marc Sarzi, Andreas Schruba, Thomas G. Williams

摘要:

我们使用高分辨率地图的分子星际介质(ISM)的中心86个附近的星系从毫米波干涉测量暗天体质量(WISDOM)和物理学高角分辨率在附近的星系(PHANGS)调查的物理机制设置的ISM的形态在分子云尺度。我们发现,早型星系往往有光滑,规则的分子气体形态,而在螺旋星系凸起的ISM是更不对称和cluerous当在相同的空间尺度上观察。我们使用非参数形态测量(不对称性、平滑度和基尼)来量化这些差异,并将这些测量结果与从理想星系模拟中提取的测量结果进行比较。我们发现,分子ISM的形态系统的变化作为各种大尺度星系参数的函数,包括星系形态类型,恒星质量,恒星速度色散,有效恒星质量表面密度,分子气体表面密度,恒星形成效率和酒吧的存在。我们进行统计分析,以确定这些相关参数最好的预测ISM的形态。我们发现有效的恒星质量表面(或体积)密度是最强的预测分子气体的形态,而恒星形成和酒吧可能是重要的次要驱动程序。我们发现,气体的自引力是不占主导地位的过程中形成的星系中心的分子气体的形态。相反,由势阱的深度引起的效应,如剪切、恒星螺旋密度波的抑制和/或流入,会影响气体碎裂的能力。

英文摘要:

We use high-resolution maps of the molecular interstellar medium (ISM) in the centres of eighty-six nearby galaxies from the millimetre-Wave Interferometric Survey of Dark Object Masses (WISDOM) and Physics at High Angular Resolution in Nearby GalaxieS (PHANGS) surveys to investigate the physical mechanisms setting the morphology of the ISM at molecular cloud scales. We show that early-type galaxies tend to have smooth, regular molecular gas morphologies, while the ISM in spiral galaxy bulges is much more asymmetric and clumpy when observed at the same spatial scales. We quantify these differences using non-parametric morphology measures (Asymmetry, Smoothness and Gini), and compare these measurements with those extracted from idealised galaxy simulations. We show that the morphology of the molecular ISM changes systematically as a function of various large-scale galaxy parameters, including galaxy morphological type, stellar mass, stellar velocity dispersion, effective stellar mass surface density, molecular gas surface density, star formation efficiency and the presence of a bar. We perform a statistical analysis to determine which of these correlated parameters best predicts the morphology of the ISM. We find the effective stellar mass surface (or volume) density to be the strongest predictor of the morphology of the molecular gas, while star formation and bars maybe be important secondary drivers. We find that gas self-gravity is not the dominant process shaping the morphology of the molecular gas in galaxy centres. Instead effects caused by the depth of the potential well such as shear, suppression of stellar spiral density waves and/or inflow affect the ability of the gas to fragment.

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