从模拟星系预测FIR谱线
Predicting FIR lines from simulated galaxies
摘要：
远红外线是研究星际介质性质的有力工具，特别是在高红移星系中，ALMA观测提供了前所未有的信息。用CLOUDY后处理的最先进的宇宙学模拟来解释这些数据，提供了对这些系统的内部结构和气体动力学的见解。然而，迄今尚未对此类分析的一致性和不确定性进行详细调查。在这里，我们比较不同的方法来估计FIR线发射从国家的最先进的宇宙学模拟，无论是云或飞行非平衡化学。我们发现，[CII] $_{158μ}$预测是强大的模型变化，我们探讨。[OI]典型地跟踪相对于[CII] $_{158μ}$更冷和更密的气体的发射谱线是与模型相关的，因为这些谱线强烈地受到气体的热力学状态和非平衡光电离效应的影响。出于同样的原因，[OI]线是约束排放模型的一个很好的工具，因此未来针对这些线的观测将是至关重要的。
英文摘要：
Far-infrared (FIR) emission lines are a powerful tool to investigate the properties of the interstellar medium, especially in high-redshift galaxies, where ALMA observations have provided unprecedented information. Interpreting such data with state-of-the-art cosmological simulations post-processed with CLOUDY, has provided insights on the internal structure and gas dynamics of these systems. However, no detailed investigation of the consistency and uncertainties of this kind of analysis has been performed to date. Here, we compare different approaches to estimate FIR line emission from state-of-the-art cosmological simulations, either with CLOUDY or with on-the-fly non-equilibrium chemistry. We find that [CII]$_{158μ}$ predictions are robust to the model variations we explored. [OI] emission lines, that typically trace colder and denser gas relative to [CII]$_{158μ}$, are instead model-dependent, as these lines are strongly affected by the thermodynamic state of the gas and non-equilibrium photoionisation effects. For the same reasons, [OI] lines represent an excellent tool to constrain emission models, hence future observations targeting these lines will be crucial.
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