大尺度拓扑结构对星系形成的影响

标准宇宙学模型已经成功的预言了由暗物质主导的大尺度结构的许多观测结果。 然而，由于涉及到复杂的重子过程，我们对星系形成的认识还处于探索阶段。近年来，随着多波段大尺度巡天数据的积累，大尺度拓扑结构对星系形成和演化的影响得到越来越多的关注。 本项目计划利用高精度的宇宙学数值模拟，和最新的观测结果， 研究以下几个方面内容：1）宇宙大尺度拓扑结构中的矮星系形成。2）考察不同大尺度环境对类银河系系统性质，尤其银河系大质量卫星星系丰度和分布的影响。3）结合光学、远红外和紫外的观测数据， 分析大尺度拓扑结构对星系中恒星形成过程的影响。 项目的完成还将产生一个完备的高质量模拟星表，为未来的巡天观测中对大尺度拓扑结构对星系性质的影响做预研究。

The standard cosmology model (LCDM), in which the Universe is dominated by dark matter and dark energy, has been successful in interpreting.many observations. We are now able to understand the formation of large-scale structures in great details. However，our knowledge of galaxy formation are rather limited given that they usually evolve complex, nonlinear and dissipative processes. During the formation of topological large-scale formation, the baryonic component become different in different environments, leading to different formation history of galaxies within them. Using the high resolution simulations and multi-wavelength data from various large-sky surveys, we plan to investigate following several astrophysics problems related to the large-scale topological structures. We plan to use cosmological hydrodynamic simulations to study the gas distribution in different topological structures, analyze the baryonic fraction in dark halos in different large-scale topological structures, and try to understand the 'too-early-formation' of dwarf galaxies problem. We will also study the Milky Way analogues in different environments to answer whether the environmental effect could alleviate the conflict about satellite statistics between the observations and model predictions . We also plan to use the SDSS, GALEX, GAMA, and Herschel data to investigate how the large-scale topological structure affects the gas content and star formation of galaxies. Meanwhile, this project will generate a complete galaxy catalogue, which can be used to do some pre-research for related surveys in the future.