arXiv 2507.024762025-07-03astro-ph.COastro-ph.GA

关于宇宙纤维的宽度与剖面

On the width and profiles of cosmic filaments

Qi-Rui Yang, Weishan Zhu, GuangYao Yu, Jian-Feng Mo, Yi Zheng, Long-Long Feng

备注：: 19 pages, 14 figures, accepted for publication in ApJ
发表信息：: Yang Q.R. et al. 2025, ApJ, Volume 989, Issue 2, id.187
DOI：: 10.3847/1538-4357/adeca3

阅读 PDF

arXiv 页面 ↗HTML 原文 ↗

AI总结：

本文利用 IllustrisTNG 模拟研究宇宙纤维的宽度与剖面，发现纤维片段宽度与晕质量密度、恒星质量密度呈线性关系，且不同宽度纤维的密度剖面具自相似性，热剖面随宽度变化，结果在多个模拟中一致。

摘要：

我们使用 IllustrisTNG 模拟研究了宇宙纤维的宽度与剖面。纤维结构通过 DisPerSE 识别，以模拟中的星系样本作为输入。由于单根纤维的宽度可能沿其脊柱发生显著变化，我们将每根纤维划分为长度介于 $1.5\\,h^{-1}\\,\mathrm{Mpc}$ 至 $2.5\\,h^{-1}\\,\mathrm{Mpc}$ 之间的片段，并测量其属性。这些纤维片段的典型宽度在红移 $z = 2.0$ 处的约 $0.3\\,\mathrm{Mpc}$ 逐渐增加至 $z = 0.0$ 处的约 $1.0-1.5\\,\mathrm{Mpc}$。我们发现片段宽度与线性晕质量密度之间呈现近乎线性的相关，这与以往研究一致。在片段宽度与线性恒星质量密度之间也观察到类似的线性关系，为纤维宽度提供了潜在的估计量。此外，不同宽度纤维的密度剖面表现出自相似性，并可用类似于等温 $β$-模型的统一公式来描述。对于给定宽度的片段，其重标度的密度剖面从 $z = 2.0$ 到 $z = 0.0$ 仅表现出轻微演化。在纤维宽度范围内，气体温度从中心到边界缓慢下降，且较厚的纤维通常包含比较薄纤维更热的气体。这些纤维宽度、密度及热剖面的趋势在 TNG50、TNG100 和 TNG300 模拟中均得到一致观察，并与早期研究结果吻合良好。我们简要讨论了这些发现的潜在意义与应用。

英文摘要：

We investigated the widths and profiles of cosmic filaments using the IllustrisTNG simulations. Filaments were identified with DisPerSE, using galaxy samples in simulations as input. Since the width of an individual filament can vary significantly along its spine, we divided each filament into segments with lengths between $1.5\,h^{-1}\,\mathrm{Mpc}$ and $2.5\,h^{-1}\,\mathrm{Mpc}$ and measure their properties. The typical width of these filament segments increases gradually from approximately $0.3\,\mathrm{Mpc}$ at redshift $z = 2.0$ to about $1.0-1.5\,\mathrm{Mpc}$ at $z = 0.0$. We find that the segment width correlates nearly linearly with the linear halo mass density, consistent with previous studies. A similar linear relation is observed between the segment width and the linear stellar mass density, providing a potential estimator for filament width. Furthermore, the density profiles of filaments with different widths exhibit self-similarity and can be described by a unified formula akin to the isothermal $β$-model. For segments with a given width, the rescaled density profiles show only mild evolution from $z = 2.0$ to $z = 0.0$. Within the filament width, the gas temperature decreases slowly from the center to the boundary, with thicker filaments generally containing hotter gas than thinner ones. These trends in filament width, density, and thermal profiles are consistently observed across the TNG50, TNG100, and TNG300 simulations, and align well with results from earlier studies. We briefly discuss the potential implications and applications of our findings.

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。

AI总结：

摘要：

英文摘要：

相关论文