标题： P-千年模拟中的星系组装与演化：星系聚类 显示英文标题

标题： Galaxy Assembly and Evolution in the P-Millennium simulation: galaxy clustering

摘要： 我们展示了来自GAEA星系形成理论模型最新版本的结果，该模型结合了从普朗克千年模拟（PMS）中提取的合并树。与千年模拟相比，PMS提供了更好的质量分辨率、更大的体积，并假设与普朗克任务最新结果一致的宇宙参数。该模型包括冷气体分配为原子和分子（H$_2$）组分的处理；改进的环境过程处理；以及对超大质量黑洞上冷气体吸积的更新建模。我们将基于PMS的GAEA预测与千年纪系列其他模拟中的模型实现进行比较，显示新模型在大多数星系群体统计属性上提供了一致性。我们认为这是由于活动星系核反馈与基于H$_2$的恒星形成率之间的相互作用，因为仅考虑这两种机制之一的模型版本没有显示出相同水平的一致性。然后，我们将模型预测与红移范围0<z$\lesssim$3的星系两点相关函数（2pCF）的可用数据进行比较。我们表明，对于比10$^{9}$ M$_\odot$更大的星系，GAEA运行正确恢复了2pCF作为恒星质量、恒星形成活动、HI含量和红移函数的主要依赖关系。这些结果表明，我们的模型正确捕捉了大规模结构中星系群体的分布以及调节其重子内容的主要物理过程之间的相互作用，无论是中心星系还是伴星系。模型预测了聚类幅度的小红移演化，这导致在z$\sim$3时聚类强度相对于现有估计值有所高估，但在1-$\sigma$不确定性范围内仍与数据一致。 显示英文摘要

摘要： [abridged] We present results from the latest version of the GAEA theoretical model of galaxy formation coupled with merger trees extracted from the Planck Millennium Simulation (PMS). With respect to the Millennium Simulation, the PMS provides a better mass resolution, a larger volume and assumes cosmological parameters consistent with latest results from the Planck mission. The model includes a treatment for the partition of cold gas into atomic and molecular (H$_2$) components; a better treatment for environmental processes; an updated modelling of cold gas accretion on Super-Massive Black Holes. We compare GAEA predictions based on the PMS, with model realizations based on other simulations in the Millennium Suite, showing that the new model provides a remarkable consistency for most statistical properties of galaxy populations. We interpret this as due to the interplay between AGN feedback and H$_2$-based SFR, as model versions considering only one of the two mechanisms do not show the same level of consistency. We then compare model predictions with available data for the galaxy 2-point correlation function (2pCF) in the redshift range 0<z$\lesssim$3. We show that GAEA runs correctly recover the main dependencies of the 2pCF as a function of stellar mass, star formation activity, HI-content and redshift for galaxies more massive than 10$^{9}$ M$_\odot$. These results suggest that our model correctly captures both the distribution of galaxy populations in the Large Scale Structure and the interplay between the main physical processes regulating their baryonic content, both for central and satellite galaxies. The model predicts a small redshift evolution of the clustering amplitude, that results in an overprediction of z$\sim$3 clustering strength with respect to the available estimates, but is still consistent with data within 1-$\sigma$ uncertainties.