再电离时期X射线对21厘米功率谱的修正
Modification of the 21-cm power spectrum by X-rays during the epoch of reionisation
摘要：
我们将从X射线的再电离的贡献内的分析和半数值模拟的21厘米的信号所产生的中性氢在再电离的时代。我们探索的影响，X射线电离的功率谱（PS）的21厘米波动的变化的平均X射线MFP和X射线的再电离的分数贡献。一般来说，在星系际介质主要由电离区域（H { \sevensize II}区域）支配的时代之前，X射线引起的电离增强了小于X射线MFP的空间尺度上的波动，前提是X射线加热不会强烈抑制星系形成。相反，在以后的时间，当\H 2区域占主导地位，在21厘米的信号小规模的波动被抑制的X射线电离。我们的建模还表明，由于X射线的存在，21厘米的信号的修改是敏感的X射线MFP的相对尺度，和\H 2区域的特征尺寸。因此，我们发现，X射线印记的时代和规模依赖的签名上的21厘米PS，其突出程度取决于分数X射线的贡献。IGM的X射线加热程度也决定了可以辨别这些特征的程度。我们表明，MWA将有足够的灵敏度来检测这种修改的PS，只要X射线光子MFP的范围内的规模超过该阵列是最敏感的（$\sim0.1$ Mpc $^{-1}$）。在这种MFP采用小得多的值的情况下，将需要具有较大收集区域的阵列。
英文摘要：
We incorporate a contribution to reionization from X-rays within analytic and semi-numerical simulations of the 21-cm signal arising from neutral hydrogen during the epoch of reionization. We explore the impact that X-ray ionizations have on the power spectrum (PS) of 21-cm fluctuations by varying both the average X-ray MFP and the fractional contribution of X-rays to reionization. In general, prior to the epoch when the intergalactic medium is dominated by ionized regions (H {\sevensize II} regions), X-ray-induced ionization enhances fluctuations on spatial scales smaller than the X-ray MFP, provided that X-ray heating does not strongly supress galaxy formation. Conversely, at later times when \H2 regions dominate, small-scale fluctuations in the 21-cm signal are suppressed by X-ray ionization. Our modelling also shows that the modification of the 21-cm signal due to the presence of X-rays is sensitive to the relative scales of the X-ray MFP, and the characteristic size of \H2 regions. We therefore find that X-rays imprint an epoch and scale-dependent signature on the 21-cm PS, whose prominence depends on fractional X-ray contribution. The degree of X-ray heating of the IGM also determines the extent to which these features can be discerned. We show that the MWA will have sufficient sensitivity to detect this modification of the PS, so long as the X-ray photon MFP falls within the range of scales over which the array is most sensitive ($\sim0.1$ Mpc$^{-1}$). In cases in which this MFP takes a much smaller value, an array with larger collecting area would be required.
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