Evolution of High-energy Electron Distribution in Pulsar Wind Nebulae  

作　　者：Yi-Ming Liu Hou-Dun Zeng Yu-Liang Xin Si-Ming Liu Yi Zhang 

机构地区：[1]Key Laboratory of Dark Matter and Space Astronomy,Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210023,China [2]School of Astronomy and Space Science,University of Science and Technology of China,Hefei 230026,China [3]School of Physical Science and Technology,Southwest Jiaotong University,Chengdu 610031,China

出　　处：《Research in Astronomy and Astrophysics》2024年第7期198-214,共17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(Nos.12220101003,12273114,U1931204,12103040,12147208 and U2031111);the Project for Young Scientists in Basic Research of Chinese Academy of Sciences(No.YSBR-061);the Program for Innovative Talents and Entrepreneur in Jiangsu。

摘　　要：In this paper,we analyze the spectral energy distributions of 17 powerful(with a spin-down luminosity greater than10~(35)erg s~(-1))young(with an age less than 15,000 yr)pulsar wind nebulae(PWNe)using a simple timein-dependent one-zone emission model.Our aim is to investigate correlations between model parameters and the ages of the corresponding PWNe,thereby revealing the evolution of high-energy electron distributions within PWNe.Our findings are as follows:(1)The electron distributions in PWNe can be characterized by a double power-law with a super-exponential cutoff.(2)As PWNe evolve,the high-energy end of the electron distribution spectrum becomes harder with the index decreasing from approximately 3.5 to 2.5,while the low-energy end spectrum index remains constant near 1.5.(3)There is no apparent correlation between the break energy or cutoff energy and the age of PWNe.(4)The average magnetic field within PWNe decreases with age,leading to a positive correlation between the energy loss timescale of electrons at the break energy or the high-energy cutoff and the age of the PWN.(5)The total electron energy within PWNe remains constant near 2×10~(48)erg,while the total magnetic energy decreases with age.

关 键 词：radiation mechanisms non-thermal-ISM general-ISM supernova remnants-gamma-rays GENERAL 

分 类 号：P145.6[天文地球—天体物理]