从天空平均射电观测中提取宇宙黎明期间全球21厘米信号的MCMC方法
An MCMC approach to extracting the global 21-cm signal during the cosmic dawn from sky-averaged radio observations
摘要：
目前正在努力使用单个无线电偶极子的天空平均观测来观测来自“宇宙黎明”的21厘米信号。在本文中，我们开发了一个模型的观测占21厘米的信号，前景，和几个主要的仪器效果。鉴于这个模型，我们应用马尔可夫链蒙特卡罗技术来证明这些仪器的能力，从前景分离的21厘米的信号和量化的能力，以约束属性的第一个星系。为了具体起见，我们调查了40和120 MHz之间的观测与拟议的DARE任务在月球轨道上，显示其潜在的科学回报。
英文摘要：
Efforts are being made to observe the 21-cm signal from the 'cosmic dawn' using sky-averaged observations with individual radio dipoles. In this paper, we develop a model of the observations accounting for the 21-cm signal, foregrounds, and several major instrumental effects. Given this model, we apply Markov Chain Monte Carlo techniques to demonstrate the ability of these instruments to separate the 21-cm signal from foregrounds and quantify their ability to constrain properties of the first galaxies. For concreteness, we investigate observations between 40 and 120 MHz with the proposed DARE mission in lunar orbit, showing its potential for science return.
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