The response of stellar discs to perturbations

恒星盘对扰动的响应

• 批准号: 2888230
• 金额: --
• 依托单位: University of Oxford
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2888230
• 关键词: response; stellar; discs; perturbations

The aim of this project is to understand the dynamics of stellar discs -- including that of our own Galaxy -- using dynamical modelling applied to data from Gaia and similar surveys.The starting point for understanding the dynamical structure of self-gravitating stellar discs is usually the construction of an axisymmetrized equilibrium model. Real stellar discs are never axisymmetric though and so the next step is to apply the methods of perturbation theory to calculate both the qualitative and quantitative response of such models to the various types of noise experienced by real discs. Most investigations to date have focused on the frequency-dependent response of the disc, but this project adopts an explicitly time-dependent approach, which also makes comparison with N-body models more straightforward. We have recently built machinery for modelling the non-resonant dynamics of 2d discs and the objectives of the project are to extend this to handle orbital resonances and to vertical structure.

该项目的目的是利用适用于盖亚和类似调查数据的动力学模型，了解恒星盘的动力学-包括我们银河系的动力学，了解自引力恒星盘动力学结构的出发点通常是建立轴对称平衡模型。然而，真实的恒星盘从来不是轴对称的，因此下一步是应用微扰理论的方法来计算这种模型对真实的盘所经历的各种类型的噪声的定性和定量响应。迄今为止，大多数研究都集中在圆盘的频率依赖性响应上，但该项目采用了一种显式的时间依赖性方法，这也使得与N体模型的比较更加简单。我们最近建造了一个机器来模拟2d圆盘的非共振动力学，这个项目的目标是将其扩展到处理轨道共振和垂直结构。