天文学进展2024，Vol.42Issue(3)：529-550,22.DOI:10.3969/j.issn.1000-8349.2024.03.09
山体对于宇宙低频总功率实验的影响
Effects of the Surrounding Mountains on the Extraction of Signals from the Global 21 cm Signal Experiment
摘要
Abstract
In this paper,we examine the influence of the surrounding mountains around the experimental antenna on the extraction of signals in the global 21 cm experiment.The change in antenna gains introduced by varying the height of the mountain,the angle of slope,the composition of the mountain,the consistency of the composition of the mountain,the distance from the mountain to the antenna,and other factors of the model is simulated using the moment hybrid numerical algorithm.We further analyze the impact of these factors on the antenna in obtaining neutral hydrogen signals.The results show that the characteristics of the mountain,including its height,distance from the observation point,inclination angle,composition material,and surface composition consistency,not only affect the antenna gain,but also further affect the polynomial fitting subtraction of the foreground in the experiment.Specifically,for antenna gain,when the mountain height remains unchanged,the farther the mountain is from the antenna,the smaller the effect on antenna gain.关键词
天线增益/山体特征/低频总功率信号Key words
antenna gain/the characteristics of the mountain/global 21 cm signal分类
天文与地球科学引用本文复制引用
沈廷燕,余赟,顾俊骅,黄滟,郭铨..山体对于宇宙低频总功率实验的影响[J].天文学进展,2024,42(3):529-550,22.基金项目
SKA专项(2020SKA0110100) （2020SKA0110100）
国家自然科学基金重点项目(12433012) （12433012）
