Study of cosmic-ray energy and spatial distribution by observing Galactic diffuse gamma-ray emission

为了研究银河系宇宙射线的能量和空间分布，我们对银河系漫射伽马射线发射进行了广泛的分析。结果可以概括为以下三个发现：银河系CR能谱与地球上直接测量的CR能谱接近；另一方面，太阳系附近的CR密度在几个100pc尺度上差异约20%；外星系的CR密度分布比基于传统模型的预期更平坦。

In order to investigate the energy and spatial distribution of Galactic cosmic-rays(CRs), we extensively analyzed Galactic diffuse gamma-ray emission. The outcome can be summarized by the following three discoveries :[ 1] The energy spectrum of Galactic CRs are close to those directly measured at the Earth[ 2] On the other hand, the CR density differ by~ 20% in a few 100 pc scale in the vicinity of the solar system[ 3] and the CR density distribution in the outer Galaxy is flatter than expectations based on a conventional model.