On the surface brightness radial profile of the extended γ-ray sources

• 作者: Rui-Zhi Yang Bing Liu
• 来源期刊: 中国科学：物理学 力学 天文学（英文版）
• 年，卷（期）: 2022,（1）
• 所属期刊栏目: Article
• 页码范围: 84-91
• 页数: 8页
• 语种: 英文

摘要

The morphology of the extended y-ray source is governed by the propagation process of parent relativistic particles.In this paper,we investigate the surface brightness radial profile of extended y-ray sources illuminated by cosmic ray protons and electrons,considering the radiation mechanisms,projection effects,and the response of instruments.We find that the parent particle species and the propagation process can cause considerable differences in the observed radial profiles.Thus,the surface brightness profile can be used as a unique tool to identify the radiation mechanism and the propagation process of the parent particles.In addi-tion,we also discuss the possible implications regarding the latest discoveries from very/ultra-high energy y-ray instruments like LHAASO and HAWC.