论文标题

使用电离区域的形态光谱推断电源源的特性

Inferring the properties of the sources of reionization using the morphological spectra of the ionized regions

论文作者

Gazagnes, Simon, Koopmans, Léon V. E., Wilkinson, Michael H. F.

论文摘要

高红移21厘米的观测将为电离时代的物理过程提供关键的见解。下一代干涉仪(例如平方公里阵列)将具有足够的灵敏度,可以直接成像21厘米波动并追踪电离前部的演变。在这项工作中,我们开发了一种推论方法,以使用数量,尤其是从现实的模拟观测值中提取的电离区域的形态学模式光谱恢复了电源的源和IgM特性。为此,我们通过包含这些21-CM层析成像统计数据来扩展Markov Chain Monte Carlo Analysis工具21CMMC,并将此方法与仅使用功率谱进行比较。我们证明,电离区域的数字计数和形态的演变随着红移的函数提供了独立的信息,以解散多个回离方案,因为它探究了每个baryon的平均电离预算。尽管不太精确,但我们发现使用21-CM层析成像统计量推断的约束对于存在污染物(例如前景残留物)的存在更强大。这项工作强调,将功率谱和层析成像分析结合起来更准确地恢复了电离的天体物理学。

High-redshift 21-cm observations will provide crucial insights into the physical processes of the Epoch of Reionization. Next-generation interferometers such as the Square Kilometer Array will have enough sensitivity to directly image the 21-cm fluctuations and trace the evolution of the ionizing fronts. In this work, we develop an inferential approach to recover the sources and IGM properties of the process of reionization using the number and, in particular, the morphological pattern spectra of the ionized regions extracted from realistic mock observations. To do so, we extend the Markov Chain Monte Carlo analysis tool 21CMMC by including these 21-cm tomographic statistics and compare this method to only using the power spectrum. We demonstrate that the evolution of the number-count and morphology of the ionized regions as a function of redshift provides independent information to disentangle multiple reionization scenarios because it probes the average ionizing budget per baryon. Although less precise, we find that constraints inferred using 21-cm tomographic statistics are more robust to the presence of contaminants such as foreground residuals. This work highlights that combining power spectrum and tomographic analyses more accurately recovers the astrophysics of reionization.

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