论文标题
长基线天线的阵列，用于从亚北极
The Array of Long Baseline Antennas for Taking Radio Observations from the Sub-Antarctic
论文作者
论文摘要
在<30 MHz下中性氢的红移21厘米发射的测量可能有可能探测宇宙“黑暗时代”，这是宇宙历史的时期，迄今为止尚未观察到。由于明亮的银河前景，电离层污染和地面射频干扰，因此对这些频率的观察非常具有挑战性。 <30 MHz的天空地图很少，大多数具有适度的分辨率。我们介绍了一系列长基线天线，用于从亚北极（信天翁）中进行无线电观测，这是一个新的实验，旨在对低频银河发射进行成像，并在现有数据方面提高了分辨率的顺序。信天翁阵列将由自主运行的天线站组成，每个记录基带数据将是干预的离线组合。阵列将安装在马里恩岛（Marion Island），最终将组成10个站点，其工作频率范围为1.2-125 MHz，最大基线长度约为20 km。我们介绍了信天翁仪器设计，并讨论2018 - 2019年从Marion Island拍摄的探路者观察。
Measurements of redshifted 21-cm emission of neutral hydrogen at <30 MHz have the potential to probe the cosmic "dark ages," a period of the universe's history that remains unobserved to date. Observations at these frequencies are exceptionally challenging because of bright Galactic foregrounds, ionospheric contamination, and terrestrial radio-frequency interference. Very few sky maps exist at <30 MHz, and most have modest resolution. We introduce the Array of Long Baseline Antennas for Taking Radio Observations from the Sub-Antarctic (ALBATROS), a new experiment that aims to image low-frequency Galactic emission with an order-of-magnitude improvement in resolution over existing data. The ALBATROS array will consist of antenna stations that operate autonomously, each recording baseband data that will be interferometrically combined offline. The array will be installed on Marion Island and will ultimately comprise 10 stations, with an operating frequency range of 1.2-125 MHz and maximum baseline lengths of ~20 km. We present the ALBATROS instrument design and discuss pathfinder observations that were taken from Marion Island during 2018-2019.
