A map of diffuse radio emission at 182 MHz to enhance epoch of reionization observations in the Southern hemisphere
A map of diffuse radio emission at 182 MHz to enhance epoch of reionization observations in the Southern hemisphere
复制标题
182MHz 的漫射无线电发射图，用于增强南半球再电离观测的时代
DOI：
10.1093/mnras/stab3276
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发表时间：
2021
影响因子：
4.8
通讯作者：
Jacobs, Daniel C.
中科院分区：
文献类型：
--
作者：
Byrne, Ruby;Morales, Miguel F.;Hazelton, Bryna;Sullivan, Ian;Barry, Nichole;Lynch, Christene;Line, Jack L. B.;Jacobs, Daniel C.
我们根据默奇森宽场阵列（MWA）的数据绘制了167-198 MHz的偏振漫射宽带图。该地图旨在提高再电离（EoR） 21cm历元实验的能见度模拟和精度校准。它占地面积很大——11000平方公里。度-在所有四个斯托克斯参数下的南半球天空，并在1-9°的角尺度上捕获发射。带平均扩散结构主要是非极化结构，但在RA = 0 h附近具有显著的线性极化结构。我们通过将该地图与GLEAM目录相结合并模拟MWA的观测结果来评估该地图的精度，结果表明，短基线（6.1-50波长）的精度现在接近于通常用于EoR校准的较长基线的精度。我们讨论了如何使用地图来模拟各种干涉阵列的可见性。该地图有可能提高实验的校准精度，如氢时代再电离阵列和即将到来的平方公里阵列以及MWA。
We present a broad-band map of polarized diffuse emission at 167–198 MHz developed from data from the Murchison Widefield Array (MWA). The map is designed to improve visibility simulation and precision calibration for 21 cm Epoch of Reionization (EoR) experiments. It covers a large swath – 11 000 sq. deg. – of the Southern hemisphere sky in all four Stokes parameters and captures emission on angular scales of 1–9°. The band-averaged diffuse structure is pre-dominantly unpolarized but has significant linearly polarized structure near RA = 0 h. We evaluate the accuracy of the map by combining it with the GLEAM catalogue and simulating an observation from the MWA, demonstrating that the accuracy of the short baselines (6.1–50 wavelengths) now approaches the accuracy of the longer baselines typically used for EoR calibration. We discuss how to use the map for visibility simulation for a variety of interferometric arrays. The map has potential to improve calibration accuracy for experiments such as the Hydrogen Epoch of Reionization Array and the forthcoming Square Kilometre Array as well as the MWA.