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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Can HI 21-cm lines trace the missing baryons in the filamentary structures?
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Can HI 21-cm lines trace the missing baryons in the filamentary structures?

机译：嗨21厘米线可以在丝状结构中追踪缺失的Baryons？

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摘要

A large fraction of baryons predicted from the standard cosmology is still missing observationally. Although previous numerical simulations have indicated that most of the missing baryons reside in large-scale filaments in the form of the warm-hot intergalactic medium (WHIM), it is generally very difficult to detect signatures from such a diffuse gas. In this work, we focus on the hyperfine transition of neutral hydrogen (HI), called the 21-cm line, as a tool to trace the WHIM. For the purpose, we first construct the map of the 21-cm signals by using the data provided by the state-of-the-art cosmological hydrodynamics simulation project, Illustris, in which detailed processes affecting the dynamical and thermal evolution of the WHIM are implemented. From a comparison of the constructed 21-cm signal map with the expected noise level of the Square Kilometre Array phase 1 mid-frequency instrument (SKA1-mid), we find that the 21-cm signals from the WHIM in the filamentary structures at redshifts z = 0.5-3 are too small to detect with the SKA1-mid. Our results suggest that a sensitivity about 10 times higher than the SKA1-mid is possibly enough to detect the WHIM at z = 0.5-3. However, we also show that the signals of the filamentary structures including the contribution from galaxies are detectable with the SKA1-mid if we assume the angular resolution of Delta theta >= 10' and the observing time of t(obs) >= 100 hr.
机译：从标准宇宙学预测的大部分重子仍然缺少。尽管先前的数值模拟表明，大多数缺失的雷静音以热热的间介质（突发奇经介质）的形式存在于大型长丝中，通常非常难以检测来自这种漫反射气体的签名。在这项工作中，我们专注于中性氢气（HI）的高血清过渡，称为21厘米的线，作为追踪突发致力的工具。为此目的，我们首先通过使用最先进的宇宙水流模拟项目，Illustris的数据来构造21厘米信号的地图，其中影响了突发致力的动态和热演化的详细过程实施的。从由所构造的21-cm信号映射的比较，平方公里阵列1中频仪器（SKA1-MID）的预期噪声水平，我们发现从闪光灯的丝状结构中的蠕动中的21厘米信号Z = 0.5-3太小而无法使用SKA1-MID检测。我们的研究结果表明，比SKA1-MID高10倍的灵敏度可能足以检测Z = 0.5-3的突发发发郎。然而，我们还表明，如果我们假设Deltaθ= 10'的角度分辨率和T（OB）> = 100小时的观察时间。

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