Studying Radiative Theory Of The Pulsar Wind Nebulae

Pulsar wind nebulae are important sources of high-energy radiation and par-ticles in the Galaxy. The energy of pulsar are continually injected into the am-bient pulsar wind nebula by relativistic particles and electromagnetic field, and charged particles can be accelerated to the relativistic by the termination shock these particles produce non-thermal radiation, which from radio to very-high energy gamma-rays through the processes the synchrotron and inverse Comp-ton scattering. The details of the particle acceleration and transmission are still unclear, although there are lots of progresses in the studies of pulsar wind neb-ulae. In this paper, we used a time-dependent evolution model to study the multi-wavelength radiation characteristics of the pulsar wind nebulae.Firstly, multi-wavelength non-thermal radiative properties of the pulsar wind nebulae MSH 15-52 and GO.9+0.1 are studied by a one-zone evolution model. The calculation results show that the multi-band observed spectra of the two sources can be explained with the reasonable parameters. The radio e-mission and the nonthermal X-rays are produced via synchrotron radiation, and the high-energy gamma rays are from inverse Compton scattering. For MSH 15-52, the spectrum of the electrons in the low energy band(< 3.0×105) has a spectral index of～1.5, whereas in the higher energy band(> 3.0×105), and the spectral index is about 2.2. Moreover, GO.9+0.1 has a spectral index of 1.23 in low energy band(< 0.2×10s), but in the higher energy band(> 0.2×105) the index is～2.5.Secondly, the spatially resolved radiative properties of the pulsar wind neb-ula HESS J1825-137 are studied by a multi-zone model. Observations show that the radiative spectrum is softer for longer distance to the pulsar. The results show that the detected space-resolved spectra in the X-rays and gamma-rays can be well reproduced with the particle spectrum which is a power law with an index of ～2.3 and an exponentially cutoff. The X-rays are produced via syn-chrotron radiation of the electrons, and the high-energy gamma-rays are from inverse Compton scattering.