利用光子守恒半数值模式SCRIPT对即将到来的21厘米观测的再电离参数的有效探索
Efficient exploration of reionization parameters for the upcoming 21 cm observations using a photon conserving semi-numerical model SCRIPT
摘要：
中性氢21厘米发射涨落的功率谱是研究宇宙再电离历史的最有希望的探测器之一。相应的分析需要计算效率的再电离建模，通常通过半数值模拟实现。我们调查的能力，这样的半数值代码，CNOT，约束的再电离参数。我们的研究涉及创建一个模拟数据集对应于即将到来的SKA-Low，其次是一个贝叶斯推断方法来约束模型参数。特别是，我们详细探讨了推断的参数是否是无偏的，相对于用于模拟的输入，如果推论是不敏感的模拟的分辨率。我们发现，该模式在两个方面都是成功的。我们还开发了一个简单的再电离模板模型，它可以模拟复杂的物理过程，如非均匀重组和辐射反馈，并表明它可以恢复全球再电离历史可靠的适度的计算成本。然而，这种简单的模型是不适合约束的电离源的属性。我们的研究结果是相关的约束再电离使用高质量的数据，预计在未来的望远镜。
英文摘要：
One of the most promising probes to constrain the reionization history of the universe is the power spectrum of neutral hydrogen 21 cm emission fluctuations. The corresponding analyses require computationally efficient modelling of reionization, usually achieved through semi-numerical simulations. We investigate the capability of one such semi-numerical code, SCRIPT, to constrain the reionization parameters. Our study involves creating a mock data set corresponding to the upcoming SKA-Low, followed by a Bayesian inference method to constrain the model parameters. In particular, we explore in detail whether the inferred parameters are unbiased with respect to the inputs used for the mock, and also if the inferences are insensitive to the resolution of the simulation. We find that the model is successful on both fronts. We also develop a simple template model of reionization which can mimic the complex physical processes like inhomogeneous recombinations and radiative feedback and show that it can recover the global reionization history reliably with moderate computational cost. However, such simple models are not suitable for constraining the properties of the ionizing sources. Our results are relevant for constraining reionization using high-quality data expected in future telescopes.
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