Atomic and molecular gas in IllustrisTNG galaxies at low redshift
Atomic and molecular gas in IllustrisTNG galaxies at low redshift
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DOI：
10.1093/mnras/stz1323
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发表时间：
2019-02
影响因子：
4.8
通讯作者：
B. Diemer;A. Stevens;C. Lagos;C. Lagos;A. R. Calette;S. Tacchella;L. Hernquist;F. Marinacci;F. Marinacci;D. Nelson;A. Pillepich;V. Rodriguez-Gomez;F. Villaescusa-Navarro;M. Vogelsberger
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文献类型：
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作者：
B. Diemer;A. Stevens;C. Lagos;C. Lagos;A. R. Calette;S. Tacchella;L. Hernquist;F. Marinacci;F. Marinacci;D. Nelson;A. Pillepich;V. Rodriguez-Gomez;F. Villaescusa-Navarro;M. Vogelsberger
我们最近开发了一个后处理框架来估计原子和分子氢（H i和H2，分别）在大容量宇宙学模拟星系的丰度。在这里，我们比较的H i和H 2的含量的IllustrisTNG星系的观测。我们主要将这种比较限制在z = 0，并考虑六个观测指标：H i和H 2的总体丰度，它们的质量函数，气体分数作为恒星质量的函数，H 2和星星形成率之间的相关性，气体的空间分布，以及气体含量和形态之间的相关性。我们发现一般良好的模拟和观测之间的协议，特别是气体分数和H i的质量尺寸关系。H2质量与星星形成率相关，揭示了几乎恒定的耗尽时间，如观察到的那样，直到z = 2。然而，我们还发现了许多具有不同程度重要性的紧张关系，包括对z = 0处的总中性气体丰度高估了约2倍，以及可能存在过量的没有或很少有中性气体的卫星。这些结论对H1/H2跃迁的模拟是可靠的。就中性气体性质而言，IllustrisTNG模拟比原始的Illustris运行有了巨大的改进。本文中使用的所有数据均作为IllustrisTNG数据发布的一部分公开提供。
We have recently developed a post-processing framework to estimate the abundance of atomic and molecular hydrogen (H i and H2, respectively) in galaxies in large-volume cosmological simulations. Here we compare the H i and H2 content of IllustrisTNG galaxies to observations. We mostly restrict this comparison to z ≈ 0 and consider six observational metrics: the overall abundance of H i and H2, their mass functions, gas fractions as a function of stellar mass, the correlation between H2 and star formation rate, the spatial distribution of gas, and the correlation between gas content and morphology. We find generally good agreement between simulations and observations, particularly for the gas fractions and the H i mass–size relation. The H2 mass correlates with star formation rate as expected, revealing an almost constant depletion time that evolves up to z = 2 as observed. However, we also discover a number of tensions with varying degrees of significance, including an overestimate of the total neutral gas abundance at z = 0 by about a factor of 2 and a possible excess of satellites with no or very little neutral gas. These conclusions are robust to the modelling of the H i/H2 transition. In terms of their neutral gas properties, the IllustrisTNG simulations represent an enormous improvement over the original Illustris run. All data used in this paper are publicly available as part of the IllustrisTNG data release.