The impact of environment on distant spiral galaxy evolution: velocity fields and Tully-Fisher relation of intermediate-redshift cluster galaxies; observations and numerical simulations

星系团对于理解宇宙中的结构增长起着基础性的作用。除了CDM理论中预期的通过合并组装星系外，其他相互作用现象在星系团环境中也很重要(星系之间，以及星系团内介质和星系气体之间的流体动力学过程，以及星系团作为一个整体的影响)。为了测试这些过程的重要性，我们研究了在很大程度上依赖于当前恒星形成活动的恒星群体(大小、亮度、形态)，以及通过其内部运动学影响的总引力势，这些内部运动学同时受到发光和暗物质的影响。我们通过星系团的结构特征(用我们的≈/ACS图)和全2维速度场(用我们的VLT3D光谱)来追踪星系团在z VLT0.5时可能的相互作用机制。为了弄清各种相互作用机制及其对星系团种群演化的重要性，我们直接将我们的观测结果与我们在星系尺度和星系团尺度上进行的N体/流体动力学模拟进行了比较。在规则运动学的情况下，可以高精度地确定Tally-Fisher关系的演化。我们在这里申请资金，以完成两个正在进行的博士论文研究(一个是观察性的，一个是数值的)。

Galaxy clusters play a fundamental role for the understanding of structure growth in the Universe. Besides the expected assembly of galaxies via mergers in the CDM theory, other interaction phenomena are important in the cluster environment (among galaxies but also hydrodynamic processes between the Intracluster Medium and the galaxy gas, and the influence of a cluster as a whole). To test the importance of these processes we study the stellar populations (sizes, luminosities, morphologies) that heavily depend on the current star formation activity, but also the total gravitational potential via their internal kinematics which are influenced by both luminous and dark matter. We trace possible interaction mechanisms of galaxies in clusters at z ≈ 0.5 by their signatures in structure (with our HST/ACS images) and in the full 2-dimensional velocity field (with our VLT 3D-spectroscopy). To disentangle the various interaction mechanisms and their importance for the evolution of the cluster population, we compare our observations directly with N-body/hydrodynamic simulations we perform both on galaxy scales and cluster scales. In the case of regular kinematics, the evolution of the Tally-Fisher relation can be determined with high accuracy. We ask here for funding to finish 2 ongoing PhD thesis studies (1 observational, 1 numerical).