Electron and positron spectra in three-dimensional spatial-dependent propagation model  

作　　者：Zhen Tian Wei Liu Bo Yang Xue-Dong Fu Hai-Bo Xu Yu-Hua Yao Yi-Qing Guo 田珍;刘伟;杨波;傅学东;许海波;姚玉华;郭义庆(Institute of Applied Physics and Computational Mathematics,Chinese Academy of Engineering,Beijing 100094,China;Key Laboratory of Particle Astrophysics,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;College of Physics,Sichuan University,Chengdu 610065,China)

机构地区：[1]Institute of Applied Physics and Computational Mathematics,Chinese Academy of Engineering,Beijing 100094,China [2]Key Laboratory of Particle Astrophysics,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [3]College of Physics,Sichuan University,Chengdu 610065,China

出　　处：《Chinese Physics C》2020年第8期193-206,共14页中国物理C（英文版）

基　　金：Supported by the National Key Research and Development Program of China(2016YFA0400200);the National Natural Science Foundation of China(11875264,11635011,11761141001,11663006)。

摘　　要：The spatial-dependent propagation(SDP)model has been demonstrated to account for the spectral hardening of both primary and secondary Cosmic Rays(CRs)nuclei above about 200 GV.In this work,we further apply this model to the latest AMS-02 observations of electrons and positrons.To investigate the effect of different propagation models,both homogeneous diffusion and SDP are compared.In contrast to the homogeneous diffusion,SDP brings about harder spectra of background CRs and thus enhances background electron and positron fluxes above tens of GeV.Thereby,the SDP model could better reproduce both electron and positron energy spectra when introducing a local pulsar.The influence of the background source distribution is also investigated,where both axisymmetric and spiral distributions are compared.We find that considering the spiral distribution leads to a larger contribution of positrons for energies above multi-GeV than the axisymmetric distribution.In the SDP model,when including a spiral distribution of sources,the all-electron spectrum above TeV energies is thus naturally described.In the meantime,the estimated anisotropies in the all-electrons spectrum show that in contrary to the homogeneous diffusion model,the anisotropy under SDP is well below the observational limits set by the Fermi-LAT experiment,even when considering a local source.

关 键 词：cosmic rays ISM:supernova remnants spiral arms and galactic disk 

分 类 号：O572.1[理学—粒子物理与原子核物理]