The Influence of the Sun and Moon on the Observation of Very High Energy Gamma-ray Sources Using EAS Arrays  

作　　者：Tao Wen Songzhan Chen Benzhong Dai 

机构地区：[1]School of Physics and Astronomy,Yunnan University,Kunming 650091,China [2]Key Laboratory of Particle Astrophysics,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [3]Tianfu Cosmic Ray Research Center,Chengdu 610000,China

出　　处：《Research in Astronomy and Astrophysics》2024年第6期245-252,共8页天文和天体物理学研究（英文版）

基　　金：supported by the National Natural Science Foundation of China under grant Nos.12393854,12022502 and 12263007;by the High-level Talent Support program of Yunnan Province。

摘　　要：With great advance of ground-based extensive air shower arrays,such as LHAASO and HAWC,many very high energy(VHE)gamma-ray sources have been discovered and are being monitored regardless of the day and the night.Hence,the Sun and Moon would have some impacts on the observation of gamma-ray sources,which have not been taken into account in previous analysis.In this paper,the influence of the Sun and Moon on the observation of very high energy gamma-ray sources when they are near the line of sight of the Sun or Moon is estimated.The tracks of all the known VHE sources are scanned and several VHE sources are found to be very close to the line of sight of the Sun or Moon during some period.The absorption of very high energy gamma rays by sunlight is estimated with detailed method and some useful conclusions are achieved.The main influence is the block of the Sun and Moon on gamma rays and the shadow on the cosmic ray background.The influence is investigated considering the detector angular resolution and some strategies on data analysis are proposed to avoid the underestimation of the gamma-ray emission.

关 键 词：astroparticle physics Sun:general methods:observational Sun:UV radiation 

分 类 号：P172.3[天文地球—天文学]