Cosmological Radiative Transfer Simulations

宇宙辐射传输模拟

• 批准号: 2604807
• 金额: --
• 依托单位: University of Cambridge
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2021
• 资助国家: 英国
• 起止时间: 2021 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2604807
• 关键词: Cosmological; Radiative; Transfer; Simulations

The epoch of reionization, a phase transition that occurred in the Universe, is a combination of several non-linear events. In an effort to understand this transition and its subsequent effects, we are utilizing large scale radiative cosmological simulations. Our current focus is to add helium to simulations through ATON - a post processing radiative transfer code. To optimally study this, we have undertaken a multi-frequency approach and are using smaller simulation boxes to constrain the number of frequency bins required. We have validated the code through astrophysical tests with known analytical solutions. Addition of helium have opened up venues to study different observables such as the mean free path, photon distribution, helium fractions while allowing us to understand the interplay between helium and hydrogen. We are also planning to change the source spectrum of the halos to incorporate the effect of quasars. The long term aim is to study reionization epoch galaxies and the physical properties of the Intergalactic Medium with radiative transfer simulations for late-end reionization histories that match Lyman-alpha forest data.

再电离时代是宇宙中发生的一种相变，是几个非线性事件的组合。为了理解这种转变及其后续效应，我们正在利用大尺度辐射宇宙学模拟。我们目前的重点是通过ATON -后处理辐射传输代码将氦添加到模拟中。为了最佳地研究这一点，我们采取了多频方法，并使用较小的模拟箱来限制所需的频率箱数量。我们已经通过天体物理测试与已知的解析解验证了代码。氦的加入为研究不同的可观测量开辟了场所，例如平均自由程，光子分布，氦分数，同时使我们能够理解氦和氢之间的相互作用。我们还计划改变晕的源光谱，以纳入类星体的影响。长期目标是研究再电离时代的星系和星系际介质的物理特性与辐射传输模拟的后期再电离的历史，匹配莱曼α森林数据。