论文标题
21厘米宇宙学的直接最佳映射：与电离阵列氢时代的演示
Direct Optimal Mapping for 21cm Cosmology: A Demonstration with the Hydrogen Epoch of Reionization Array
论文作者
论文摘要
由对21cm宇宙学具有明确定义的统计特性的宽阔图像的渴望，我们实施了最佳的映射管道，该管道使用干涉测量方程来计算天空的最大似然估计器。我们证明了这种直接的最佳映射，其中包括来自氢气时代（HERA）I期观察的数据。通过模拟数据验证管道后，我们开发了最大似然的合格，用于比较166MHz的四个天空模型，带宽为100kHz。 HERA数据与GLEAM目录相一致，至<10％。减去闪光点源后，HERA数据区分了不同的连续天体模型，为Byrne等人的模型提供了最大的支持。 2021。我们报告了映射HERA I期数据的计算成本，并为HERA 320-Antenna数据投影计算；两者都可以使用现代服务器。该算法广泛适用于其他干涉仪，对宽场和非环形阵列有效。
Motivated by the desire for wide-field images with well-defined statistical properties for 21cm cosmology, we implement an optimal mapping pipeline that computes a maximum likelihood estimator for the sky using the interferometric measurement equation. We demonstrate this direct optimal mapping with data from the Hydrogen Epoch of Reionization (HERA) Phase I observations. After validating the pipeline with simulated data, we develop a maximum likelihood figure-of-merit for comparing four sky models at 166MHz with a bandwidth of 100kHz. The HERA data agree with the GLEAM catalogs to <10%. After subtracting the GLEAM point sources, the HERA data discriminate between the different continuum sky models, providing most support for the model of Byrne et al. 2021. We report the computation cost for mapping the HERA Phase I data and project the computation for the HERA 320-antenna data; both are feasible with a modern server. The algorithm is broadly applicable to other interferometers and is valid for wide-field and non-coplanar arrays.
