| On the surface brightness radial profile of the extendedγ-ray sources |
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| 作者姓名： | Rui-Zhi Yang Bing Liu |
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| 作者单位： | Department of Astronomy;CAS Key Labrotory for Research in Galaxies and Cosmology;School of Astronomy and Space Science;Key Laboratory of Modern Astronomy and Astrophysics（Nanjing University） |
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| 基金项目： | supported by the National Natural Science Foundation of China(Grant Nos.11421303,and 12041305);the National Youth Thousand Talents Program in China;supported by the Fundamental Research Funds for the Central Universities。 |
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| 摘 要： | The morphology of the extendedγ-ray source is governed by the propagation process of parent relativistic particles.In this paper,we investigate the surface brightness radial profile of extendedγ-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 addition,we also discuss the possible implications regarding the latest discoveries from very/ultra-high energyγ-ray instruments like LHAASO and HAWC.
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| 关 键 词： | cosmic rays γ-ray sources diffuse emission |
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