Very Low Frequency Electromagnetic Wavse Absorption and Free Electron Gas Distribution in the Milky Way

Subjects: Astronomy submitted time 2024-03-22 Cooperative journals: 《天文学进展》

LU Hao ZHU Yu-tong CAO Zhou-jian DING You HAN Wen-biao

Abstract： Electromagnetic waves will be absorbed when they pass through the atmo#2;sphere. Electromagnetic waves with some frequencies are absorbed more, while electromag#2;netic waves with other frequencies are absorbed less. The frequency range within which the electromagnetic waves are less absorbed is called the atmospheric window of electro#2;magnetic waves. Similarly, the propagation of electromagnetic waves in the universe will be absorbed by the galactic medium. This paper investigates the problem of the absorption of electromagnetic wave when it propagates in the Milky Way. Our analysis shows that there is a lower cut-off frequency for the electromagnetic waves which can reach the earth passing through the Milky Way. Interestingly, the lower cut-off frequency is different respect to different direction on the celestial sphere, which gives a distribution. This distribution is closely related to the distribution of free electron gas in the Milky Way. We propose to determine the distribution of free electron gas in the Milky Way by measuring the cut-off frequency distribution.

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