Modeling Star Clusters Across Cosmic Time

跨宇宙时间的星团建模

• 批准号: 522952537
• 负责人: Professor Dr. Rainer Spurzem
• 金额: --
• 依托单位: Astronomisches Rechen-Institut
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/522952537?language=en
• 关键词: Modeling; Star; Clusters; Across; Cosmic

The approximately 150 Globular star clusters (GCs) of the Milky Way are among the oldest objects in our Galaxy. Many galaxies in the Local Group have GCs, and they have been detected around massive galaxies like M87. Recent deep observations show GCs at high redshifts. Computer simulations of structure formation in the universe begin to resolve GC scales; future instruments and better simulations will soon provide a census of properties of GCs out to cosmological distances. Main dynamical processes in GCs such as internal relaxation, stellar evolution, dynamics of few-body encounters, tidal fields are understood in principle, but a comprehensive picture of GC evolution is still missing. High performance computing using accelerators (GPU) and direct N-body simulation allows for the first time to do a larger sample of complete simulations of these enigmaic objects including real star number and all astrophysical effects. Our models will be done in close coordination and mutual checking with Monte Carlo (MOCCA) models - they allow a much larger survey sample, but provide less details and less accurate models of the history of all individual objects in the star cluster. GCs emit gravitational radiation from merging black holes and neutron stars; our models will constrain the parameters of gravitational wave sources in GCs. Furthermore some fiducial models of Galactic globular clusters are planned which can be compared with high resolution spectrophotometric observations, obtained with the MUSE instrument at the Very Large Telescope (VLT) of the European Southern Observatory (ESO) by our observational collaborators.

银河系中大约150个球状星团(GC)是我们银河系中最古老的天体之一。本星系群中的许多星系都有GC，它们已经在M87等大质量星系周围被探测到。最近的深度观测显示，GC处于高红移。宇宙中结构形成的计算机模拟开始解决GC尺度；未来的仪器和更好的模拟将很快提供GC的性质普查，直到宇宙距离。主要动力学过程，如内弛豫、恒星演化、少体相遇动力学、潮汐等已基本了解，但对GC演化的全面认识尚不清楚。使用加速器(GPU)和直接N体模拟的高性能计算首次允许对这些神秘物体进行更大样本的完整模拟，包括真实恒星数量和所有天体物理效应。我们的模型将与蒙特卡罗(MOCCA)模型密切协调和相互核对--它们允许更大的调查样本，但提供的细节较少，对星团中所有单个天体的历史模型也不太准确。GCS从合并的黑洞和中子星中发出引力辐射；我们的模型将约束GCS中引力波源的参数。此外，还计划了一些银河系球状星团的基准模型，这些模型可以与我们的观测合作者在欧洲南方天文台(ESO)的甚大望远镜(VLT)上使用MUSE仪器获得的高分辨率光谱观测结果进行比较。