银河系磁场向宇宙空洞的湍流输运：来自IllustrisTNG的见解
Turbulent Transport of Galactic Magnetic Fields into Cosmic Voids: Insights from IllustrisTNG
查看机构详情
- Graduate School of Science, Nagoya University（名古屋大学大学院理学研究科）
- Kobayashi-Maskawa Institute for the Origin of Particles and the Universe, Nagoya University（名古屋大学小林-益川粒子宇宙起源研究所）
- Institute for Advanced Research, Nagoya University（名古屋大学高等研究院）
机构由 AI 辅助整理，请以论文原文为准。
浏览论文内容
中文总结 AI 辅助
研究银河系磁场在膨胀宇宙中的扩散，通过分析IllustrisTNG模拟数据集估算湍流磁扩散率，得出当今磁屏蔽长度约7 Mpc，发现其在空洞磁化中作用比之前估计更重要。
中文摘要 AI 辅助
与星系相关的天体物理过程可能有助于宇宙空洞的磁化。我们研究了在存在湍流磁扩散率的膨胀宇宙中银河系磁场的扩散。为估算湍流磁扩散率，我们分析了IllustrisTNG模拟的TNG50 - 1数据集，并从星系际介质的特征湍流速度和湍流尺度得出其红移依赖性。利用所得扩散率，我们发现当今的磁屏蔽长度约为7 Mpc，比基于恒定湍流扩散率的先前估计大二十倍左右。该尺度对应于宇宙空洞特征尺寸的很大一部分，表明银河系磁场在空洞磁化中能发挥比先前估计更重要的作用。
英文摘要
Astrophysical processes associated with galaxies may contribute to the magnetization of cosmic voids. We investigate the diffusion of galactic magnetic fields in an expanding universe in the presence of turbulent magnetic diffusivity. To estimate the turbulent magnetic diffusivity, we analyze the TNG50-1 data set of the IllustrisTNG simulation and derive its redshift dependence from the characteristic turbulent velocity and turbulent scale of the intergalactic medium. Using the resulting diffusivity, we find a present-day magnetic screening length of $\sim 7\,{\rm Mpc}$, roughly twenty times larger than previous estimates based on a constant turbulent diffusivity due to the larger turbulent scale obtained in our analysis. This scale corresponds to a significant fraction of the characteristic size of cosmic voids and suggests that galactic magnetic fields can play a more important role in void magnetization than previously estimated.
