A new perspective on the diffuse gamma-ray emission excess  

作　　者：En-Sheng Chen Kun Fang Xiao-Jun Bi 陈恩生;方堃;毕效军(Key Laboratory of Particle Astrophysics,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]Key Laboratory of Particle Astrophysics,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [2]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Chinese Physics C》2024年第11期162-169,共8页中国物理C（英文版）

基　　金：Supported by the National Natural Science Foundation of China (12105292,12175248,12393853)。

摘　　要：The Large High-Altitude Air Shower Observatory(LHAASO)recently published measurements of diffuse Galactic gamma-ray emission(DGE)in the 10−1000 TeV energy range.The measured DGE flux is significantly higher than the expectation from hadronic interactions between cosmic rays(CRs)and the interstellar medium.This excess has been proposed to originate from unknown extended sources produced by electron radiation,such as pulsar wind nebulae or pulsar halos(PWNe/halos).In this paper,we propose a new perspective to explain the DGE excess observed by LHAASO.The masking regions used in the LHAASO DGE measurement may not fully encompass the extended signals of PWNe/halos.By employing a two-zone diffusion model for electrons around pulsars,we find that the DGE excess in most regions of the Galactic plane can be well explained by the signal leakage model under certain parameters.Our results indicate that this signal leakage from known sources and contributions from unresolved sources should be considered as complementary in explaining the DGE excess.

关 键 词：cosmic rays diffuse gamma-ray emission pulsar wind nebulae pulasr halos two-zone diffusion 

分 类 号：O571.323[理学—粒子物理与原子核物理]