Research on cosmic-ray acceleration and propagation by using very high energy (TeV) gamma rays

这项研究的目的是利用超高能(TeV)伽马射线来研究宇宙射线(CRS)的起源。CanGaroo-II成像原子切伦科夫望远镜(IACT)探测到来自银河系中心和超新星遗迹(SNR)RX J0852.0-4622的TeV伽马射线发射。我为构建无线电到TeV伽马射线的非热辐射模型做出了贡献。这些天体的多波段光谱模型对于理解银河系CRS的粒子加速和传播是必要的。CanGaroo团队引入了用于无偏差立体观测分析的Fisher判别法。而CanGaroo-III立体IACT证实了船帆座脉冲星风星云的扩展TeV伽马射线发射，这是由H.E.SS立体系统探测到的。我们还利用Chandra对年轻SNR中非热X射线细丝的观测对扩散激波加速进行了约束。此外，我们还讨论了CR光谱中PeV(膝部)附近光谱断裂的可能来源。我们假设了河外CRS，并用数值模拟的方法研究了银河风对它们的调制作用。我们发现，膝部结构是由河外调制的CRS和起源于SNR的银河CRS叠加而成的。

This purpose of this research is to investigate the origin of cosmic rays (CRs), by using very high energy (TeV) gamma rays. The CANGAROO-II Imaging Atomspheric Cherenkov Telescope (IACT) has detected TeV gamma-ray emissions from the Galactic Center and the supernova remnant (SNR) RX J0852.0-4622. I contribute to constructing the nonthermal emission models for radio-to-TeV gamma rays. The modeling of multiband spectra for these objects is necessary for understanding particle acceleration and propagation of the galactic CRs. The CANGAROO team introduced the Fisher discriminant method for bias-free stereoscopic observational analysis. And the CANGAROO-III stereoscopic IACT confirmed the extended TeV gamma-ray emission from the Vela pulsar wind nebula, which was detected by the H.E.S.S. stereoscopic system. We also put constraints on the diffusive shock acceleration by using the Chandra Observation of nonthermal X-ray filaments in young SNRs. Moreover, we discuss a possible origin of the spectral break near PeV (knee) in CR spectrum. We assume the hypothetical extragalactic CRs and investigate effects of their modulation by the galactic wind by using numerical simulations. We found that the knee structure is reproduced by a superposition of the extragalactic modulated CRs and the galactic ones originating from SNRs.