论文标题
环境对Gaea半分析模型中卫星星系的影响
The influence of environment on satellite galaxies in the GAEA semi-analytic model
论文作者
论文摘要
重现观测到的卫星星系淬灭的部分，对于银河形成模型来说，这是一个长期存在的问题。我们修改了最先进的星系演化和组装（GAEA）半分析模型中环境效应的处理，以改善我们的卫星星系建模。具体而言，我们逐渐剥离热气体，对冷气的RAM压力剥离以及更新的算法，以说明模型星系的气态和恒星盘组件之间的角动量交换。我们更新的模型与观察到的中央和卫星星系的淬灭部分以及它们对恒星质量和光晕质量的依赖性非常吻合。我们还发现模型预测与卫星星系淬灭时间的观察估计之间的一致性；嗨，h $ _2 $中央星系的分数； HI，h $ _2 $，sfr sfr sfraxies in Cluster Haloes中的缺陷。分析我们更新模型的结果，我们发现主要的淬火机制是低质量星系的热气体剥离，以及用于大型星系的AGN反馈。冷气的RAM压力剥离对预测的淬火部分的影响有限，尽管如此，仍需要重现观察到的HI缺陷。
Reproducing the observed quenched fraction of satellite galaxies has been a long-standing issue for galaxy formation models. We modify the treatment of environmental effects in our state-of-the-art GAlaxy Evolution and Assembly (GAEA) semi-analytic model to improve our modelling of satellite galaxies. Specifically, we implement gradual stripping of hot gas, ram-pressure stripping of cold gas, and an updated algorithm to account for angular momentum exchanges between the gaseous and stellar disc components of model galaxies. Our updated model is in good agreement with the observed quenched fractions for central and satellite galaxies, and their dependencies on stellar mass and halo mass. We also find consistency between model predictions and observational estimates of quenching time for satellite galaxies; HI, H$_2$ fractions of central galaxies; and deficiencies of HI, H$_2$, SFR of galaxies in cluster haloes. Analysing results from our updated model, we find that the dominant quenching mechanisms are hot-gas stripping for low-mass galaxies, and AGN feedback for massive galaxies. The Ram-pressure stripping of cold gas has a limited impact on the predicted quenched fractions, nonetheless, is needed to reproduce the observed HI deficiencies.
