论文标题
在存在电离层效应的情况下，用于天空平均21厘米实验的贝叶斯数据分析
Bayesian Data Analysis for Sky-averaged 21-cm Experiments in the Presence of Ionospheric Effects
论文作者
论文摘要
电离层在低频无线电波上引入色差，因此为21 cm宇宙学带来了障碍。在本文中，我们介绍了随时间变化的色层对全局21-CM数据分析管道的模拟天线温度数据的影响，并尝试检测注射的全局信号。我们证明，给定的湍流电离层条件，我们了解电离层参数的5 \％误差可能导致相对较低的证据和较高的根平方误差（RMSE），这表明是错误的或无效的检测。当使用恒定的天线束以在不同时间包含数据的情况下，随着时间样本数量的增加，检测的显着性降低。还表明，对于在不同时间包含数据的观察结果，根据时间变化的电离层条件进行重新调整的光束配置应大大提高检测的意义，产生较高的证据和较低的RMSE，并且在电离层条件不是理想时成功检测的必要过程。
The ionosphere introduces chromatic distortions on low frequency radio waves, and thus poses a hurdle for 21-cm cosmology. In this paper we introduce time-varying chromatic ionospheric effects on simulated antenna temperature data of a global 21-cm data analysis pipeline, and try to detect the injected global signal. We demonstrate that given turbulent ionospheric conditions, more than 5\% error in our knowledge of the ionospheric parameters could lead to comparatively low evidence and high root-mean-square error (RMSE), suggesting a false or null detection. When using a constant antenna beam for cases that include data at different times, the significance of the detection lowers as the number of time samples increases. It is also shown that for observations that include data at different times, readjusting beam configurations according to the time-varying ionospheric conditions should greatly improve the significance of a detection, yielding higher evidences and lower RMSE, and that it is a necessary procedure for a successful detection when the ionospheric conditions are not ideal.
