多相气体半解析星系形成模型中的恒星形成
Star Formation in Semi-Analytic Galaxy Formation Models with Multiphase Gas
摘要：
我们实现物理动机的食谱分割成不同的阶段（原子，分子和电离）的星系内的半解析模型的星系形成的基础上宇宙学合并树的冷气体。然后，我们模型的分子气体转化为恒星使用经验的食谱最近的观察动机。我们探索这些新配方的基本星系性质的演变，如恒星质量，恒星形成率（SFR），气体和恒星相金属丰度的影响。我们提出的恒星质量函数的预测，恒星质量与SFR的关系，冷气相和恒星质量的金属丰度的关系，我们的基准模型，从红移$z\sim 6$到今天。此外，我们提出的全球SFR，大规模组装的历史和宇宙富集的历史预测。我们发现，预测的恒星性质的星系（恒星质量，SFR，金属丰度）是显着不敏感的细节用于分区气体到HI和H $_2$的食谱。我们看到H $_2$形成的配方只有在非常低的质量晕，主机星系，目前的观测设施是无法检测到的，除了非常接近。低质量星系的性质也对将H $_2$转化为恒星的配方细节相当不敏感，而大质量星系的形成时期确实显著依赖于此。（节录）
英文摘要：
We implement physically motivated recipes for partitioning cold gas into different phases (atomic, molecular, and ionized) in galaxies within semi-analytic models of galaxy formation based on cosmological merger trees. We then model the conversion of molecular gas into stars using empirical recipes motivated by recent observations. We explore the impact of these new recipes on the evolution of fundamental galaxy properties such as stellar mass, star formation rate (SFR), and gas and stellar phase metallicity. We present predictions for stellar mass functions, stellar mass vs. SFR relations, and cold gas phase and stellar mass-metallicity relations for our fiducial models, from redshift $z\sim 6$ to the present day. In addition we present predictions for the global SFR, mass assembly history, and cosmic enrichment history. We find that the predicted stellar properties of galaxies (stellar mass, SFR, metallicity) are remarkably insensitive to the details of the recipes used for partitioning gas into HI and H$_2$. We see significant sensitivity to the recipes for H$_2$ formation only in very low mass halos, which host galaxies that are not detectable with current observational facilities except very nearby. The properties of low-mass galaxies are also quite insensitive to the details of the recipe used for converting H$_2$ into stars, while the formation epoch of massive galaxies does depend on this significantly. (Abridged)
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