SIGAME v3：用于更精确红外线发射模拟的宇宙学模拟后处理中的气体碎裂
SIGAME v3: Gas Fragmentation in Post-processing of Cosmological Simulations for More Accurate Infrared Line Emission Modeling
摘要：
我们提出了一个更新的框架，称为模拟器的银河毫米/亚毫米波发射（SNOWGAME）。在基于粒子的宇宙流体动力学模拟中，通过在模拟完成后的后处理步骤应用辐射转移和物理配方，SLENGGAME推导出星系远红外线（FIR）的线发射。在该版本中，开发了一种新技术，通过在更高分辨率的模拟中参数化气体密度概率分布函数（PDF）来模拟更高的气体密度，以用作查找表，从而允许比以前的工作更具自适应性的PDF。在SIMBA宇宙学模拟的红移z = 0星系上测试了SNORGGAME v3，其中8条FIR发射线跟踪了截然不同的星际介质相位。包括尘埃辐射转移的SKIRT和高分辨率光电离模型的Cloudy，这种新方法能够自洽地再现观测到的线光度和恒星形成率之间的关系，除了[NII]122，[NII]205和[OI]63，它们的光度分别被高估了1.6，1.2和1.2 dex。我们将与观测结果的其余分歧归因于缺乏星际光在次网格尺度（<200 pc）上的精确衰减。
英文摘要：
We present an update to the framework called SImulator of GAlaxy Millimeter/submillimeter Emission (SÍGAME). SÍGAME derives line emission in the far-infrared (FIR) for galaxies in particle-based cosmological hydrodynamics simulations by applying radiative transfer and physics recipes via a post-processing step after completion of the simulation. In this version, a new technique is developed to model higher gas densities by parametrizing the gas density probability distribution function (PDF) in higher resolution simulations for use as a look-up table, allowing for more adaptive PDFs than in previous work. SÍGAME v3 is tested on redshift z = 0 galaxies drawn from the SIMBA cosmological simulation for eight FIR emission lines tracing vastly different interstellar medium phases. Including dust radiative transfer with SKIRT and high resolution photo-ionization models with Cloudy, this new method is able to self-consistently reproduce observed relations between line luminosity and star formation rate in all cases, except for [NII]122, [NII]205 and [OI]63, the luminosities of which are overestimated by median factors of 1.6, 1.2 and 1.2 dex, respectively. We attribute the remaining disagreement with observations to the lack of precise attenuation of the interstellar light on subgrid scales (<200 pc).
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