Studying 21cm power spectrum with one-point statistics

Studying 21cm power spectrum with one-point statistics
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用单点统计研究 21cm 功率谱

DOI:
10.1093/mnras/stv965
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发表时间:
2015
影响因子:
4.8
通讯作者:
Shuichiro Yokoyama and Kiyotomo Ichiki,
Shuichiro Yokoyama and Kiyotomo Ichiki,
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Hayato Shimabukuro;Shintaro Yoshiura;Keitaro Takahashi;Shuichiro Yokoyama and Kiyotomo Ichiki,

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来自中性氢原子的红移21厘米谱线信号是探测宇宙黎明和再电离时代的一个很有前途的工具。正在进行的和未来的低频无线电实验预计将检测到它的波动,特别是通过功率谱。本文给出了21cm亮温涨落功率谱随时间演化的物理解释,功率谱可分解为暗物质密度、自旋温度和氢涨落中性分数。从一点统计的波动,如方差和偏度,我们发现,在时间演化的峰和谷深相关的X射线加热的星系际气体,控制自旋温度。我们建议的亮度温度分布的偏度是一个关键的观察,以确定X射线加热的发病。
The redshifted 21cm line signal from neutral hydrogens is a promising tool to probe the cosmic dawn and the epoch of reionization. Ongoing and future low-frequency radio experiments are expected to detect its fluctuations, especially through the power spectrum. In this paper, we give a physical interpretation of the time evolution of the power spectrum of the 21cm brightness temperature fluctuations, which can be decomposed into dark matter density, spin temperature and neutral fraction of hydrogen fluctuations. From the one-point statistics of the fluctuations, such as variance and skewness, we find that the peaks and dips in the time evolution are deeply related to X-ray heating of the intergalactic gas, which controls the spin temperature. We suggest the skewness of the brightness temperature distribution is a key observable to identify the onset of X-ray heating.
再电离时代的 21 厘米背景各向异性中的大尺度非高斯性
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