星链会淹没一些SKA频率

IF 14.3 1区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Nature Astronomy Pub Date : 2025-08-18 DOI:10.1038/s41550-025-02645-0

Lindsay Oldham

引用次数: 0

摘要

地面无线电观测站和低地球轨道人造卫星的共存需要不断进行谈判。尽管某些频率是受天文学研究保护的，但越来越明显的是，巨型星座星链正在关键的观测频率上发射意想不到的辐射。迪伦·格里格（Dylan Grigg）和合著者利用工程开发阵列2 （EDA-2）——低平方公里阵列（SKA-Low）的原型——在观测中调查了这些卫星的外观，并展示了它们在低平方公里阵列（SKA-Low）观测带宽上的持续发射。作者在29个独特的频率上进行了24小时的观测，并通过模拟卫星随时间的预期位置和评估拟合质量来检测卫星；如果一颗卫星在五个或五个以上不同的时间步长被探测到，则认为它已被识别。总共识别了1806颗独特的卫星，其发生率取决于频率和161.7和170.5 MHz频道的峰值，其中卫星出现在所有图像的30%。最新一代的卫星模型主导了探测，反映了星链巨型星座的迅速扩张及其对天文学的持续干扰（P.伍兹）。Nat. Astron. 8, 1212；2024)。发现发射的平均通量密度为93 Jy束−1，比表征再电离时代（SKA的主要科学目标）所需的噪声水平高5个数量级。

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来源期刊

Nature Astronomy Physics and Astronomy-Astronomy and Astrophysics

CiteScore

19.50

自引率

2.80%

发文量

252

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