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arXiv 2501.09083astro-ph.GA
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星系外流驱动的冷云离子密度

Ion densities of cold clouds driven by galactic outflows

Lisiyuan Yang, Neal Katz, Evan Scannapieco, Marcus Brüggen

AI总结:

本研究针对星系周介质多相相互作用问题,开展冷云穿行热CGM的云粉碎模拟分析离子分布与模拟光谱,发现多相吸收特征,但无法解释高电离离子与低电离离子共存的观测现象。

摘要:

对星系周介质(CGM)的观测常显示电离态差异极大的物种存在重合吸收,为复杂的多相相互作用提供了直接证据。受这些观测结果的启发,我们开展了一系列云粉碎模拟,对穿行于热CGM中的冷云进行建模。我们分析了这些冷云的离子分布,生成了模拟吸收光谱,并研究了其对类星体(QSO)吸收观测的启示。我们的结果展现出有趣的多相特征:电离势差异显著的离子存在于同一吸收体中,且具有相似的光谱特征。然而,我们的模拟无法解释O vi等高电离离子,以及它们与许多已观测到的QSO吸收系统中出现的低电离离子共存的现象。

英文摘要:

Observations of the circumgalactic medium (CGM) often display coincident absorption from species with widely varying ionization states, providing direct evidence for complex, multiphase interactions. Motivated by these measurements, we perform a series of cloud-crushing simulations that model cold clouds traveling through the hot CGM. We analyze the ion distributions of these clouds, generate mock absorption spectra, and study their implications on quasar (QSO) absorption observations. Our results show interesting multiphase features, in which ions with significantly different ionization potentials exist in the same absorber and share similar spectral features. However, our simulations are unable to explain high ions like O \textsc{vi} and their coexistence with lower ions that appear in many observed QSO absorption systems.

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