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arXiv 2602.20733astro-ph.GAastro-ph.CO
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星系在宇宙网中的演化:节点和丝状结构在EAGLE模拟中的相对影响

Galaxy evolution in the cosmic web: the relative impact of nodes and filaments in the EAGLE simulation

Biswa Bangla Biswabidyalay(比斯瓦·班加拉·比斯瓦比亚亚莱);Visva-Bharati University(维斯瓦-婆罗多大学);Harish-Chandra Research Institute, HBNI(哈里什-钱德拉研究所,HBNI)

Suman Sarkar, Biswajit Pandey, Apashanka Das

AI总结:

研究通过EAGLE模拟探讨宇宙网中节点和丝状结构对星系演化的影响,发现红星系靠近节点和丝状结构,蓝星系在边缘,环境影响随距离和质量变化而呈现不同特征。

摘要:

星系在复杂的宇宙网几何结构中演化,但其主要组成部分——节点和丝状结构的各自作用仍不完全清楚。利用EAGLE宇宙流体动力学模拟,我们研究了距离丝状脊柱和集群尺度节点的远近如何共同和独立地影响星系演化。星系通过完全数据驱动的熵阈值技术分为红、绿和蓝群体,节点和丝状结构通过DisPerSE识别。我们发现红星系倾向于居住在丝状核心和节点附近,而蓝星系主导边缘地区。这种空间分离揭示了两个特征转换尺度:一个与节点相关的转换在约2.5兆帕斯卡处,一个与丝状结构相关的转换在约0.75兆帕斯卡处。为进一步量化环境影响,我们采用信息论方法,并在d_f-d_n平面上测量主导质量成分与星系颜色之间的归一化互信息。质量-颜色耦合随着远离节点的距离增加而在固定丝状结构接近度下增强,表明在集群尺度环境中这种关系减弱,在丝状区域则更强烈。这种行为强烈依赖于质量,低质量星系表现出比高质量系统更显著的环境调制。这些结果支持了在宇宙网中星系演化的尺度依赖观点,突显了节点和丝状结构的各自独特和互补影响。

英文摘要:

Galaxies evolve within the intricate geometry of the cosmic web, yet the distinct roles of its primary components - nodes and filaments remain incompletely understood. Using the EAGLE cosmological hydrodynamical simulation, we investigate how distances to filament spines and cluster-scale nodes jointly and independently influence galaxy evolution. Galaxies are classified into red, green, and blue populations through a fully data-driven entropic thresholding technique, and the nodes and filaments are identified using DisPerSE. We find that red galaxies preferentially reside near filament cores and nodes, whereas blue and green galaxies dominate the outskirts. This spatial segregation reveals two characteristic transition scales: a node-related crossover at $\sim 2.5~\mathrm{Mpc}$ and a filament-related crossover at $\sim 0.75~\mathrm{Mpc}$. To further quantify environmental influence, we adopt an information-theoretic approach and measure the normalised mutual information between dominant mass component and galaxy colour across the $d_{\mathrm{f}}$-$d_{\mathrm{n}}$ plane. The mass-colour coupling increases with distance from nodes at fixed filament proximity, indicating a weakening of this relation in cluster-scale environments and a stronger coupling within filamentary regions. This behaviour is strongly mass dependent, with low-mass galaxies exhibiting a more pronounced environmental modulation than high-mass systems. These results support a scale-dependent view of galaxy evolution across the cosmic web, highlighting the distinct and complementary influence of nodes and filaments.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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