论文标题
现实的多组分星系模型I中大量遗物的动态演变I：实施和验证
Dynamical evolution of massive perturbers in realistic multi-component galaxy models I: implementation and validation
论文作者
论文摘要
星系是由包括球形，轴向和三轴对称性的几个组成部分组成的自我塑造结构。尽管实际系统具有属性密切相关的异质组件，但半分析方法通常会利用泊松方程的线性性，以表示多组分星系的潜在和质量分布作为单个组件的总和。在这项工作中，我们扩展了Bonetti等人开发的半分析框架。 （2020）既包括指数盘的重力潜力的详细实现（以$ {\ rm sech}^2 $建模和指数垂直剖面），也可以通过旋转圆盘结构中的复合星系模型中的大规模Perturbers经历的动态摩擦进行准确的处方。这种改进使我们能够在银河盘平面内或外部发展任意轨道。我们验证了通过数值模型对公共半分析代码以及完整的N体模拟获得的结果，发现我们的模型与与之比较的代码非常吻合。重现负责大规模Perturber轨道演变及其计算效率的相关物理过程的能力，使我们的框架非常适合大型参数空间探索研究。
Galaxies are self-gravitating structures composed by several components encompassing spherical, axial and triaxial symmetry. Although real systems feature heterogeneous components whose properties are intimately connected, semi-analytical approaches often exploit the linearity of the Poisson's equation to represent the potential and mass distribution of a multi-component galaxy as the sum of the individual components. In this work, we expand the semi-analytical framework developed in Bonetti et al. (2020) by including both a detailed implementation of the gravitational potential of exponential disc (modelled with a ${\rm sech}^2$ and an exponential vertical profile) and an accurate prescription for the dynamical friction experienced by massive perturbers in composite galaxy models featuring rotating disc structures. Such improvements allow us to evolve arbitrary orbits either within or outside the galactic disc plane. We validate the results obtained by our numerical model against public semi-analytical codes as well as full N-body simulations, finding that our model is in excellent agreement to the codes it is compared with. The ability to reproduce the relevant physical processes responsible for the evolution of massive perturber orbits and its computational efficiency make our framework perfectly suited for large parameter-space exploration studies.
