Gamma暴余辉的相对论流体动力学演化和光变曲线  

Hydrodynamic Evolution of GRB Afterglow and the Study of the Light Curves

作　　者：毛基荣[1] 

机构地区：[1]中国科学院云南天文台,云南昆明650011

出　　处：《云南天文台台刊》2002年第1期80-80,共1页Publications of the Yunnan Observatoty

摘　　要：本文首先对Gamma暴的观测特性和物理过程作了简要的介绍 ,而后 ,对火球模型的相对论流体动力学机制和同步加速辐射机制作了论述。主要工作是 :具体研究火球所抛出壳层的相对论流体动力学演化 ,应用同步加速辐射机制 ,通过由共动坐标系到实验室坐标系的相对论变换 ,得到Gamma暴余辉的光变曲线。对于火球壳层的不同的动力学演化规律 ,各向同性或各向异性的壳层抛出形式 ,以及不同的外部介质环境 ,所得到的光变曲线都各不相同。通过对这些不同的光变曲线的比较 ,明确了Gamma暴余辉的整体的物理演化图象以及各种物理过程在Gamma暴余辉演化过程中所起的作用 。In the present thesis, it is introduced for the observed characters and physical processes of the gamma-ray burst. Then, the hydrodynamic evolution and synchrotron mechanism of fireball / blast wave model are discussed. The hydrodynamic evolution of the fireball shell is comprehensively studied. Using the synchrotron mechanism and relativistic transformation from co-moving frame to lab frame, the light curves of the gamma-ray burst afterglow are obtained. These light curves are different for various dynamic evolution of the shell, isotropic or anisotropic cases and various environment of the media. Through comparing these different light curves, the whole physical evolution of the gamma-ray burst afterglow and the various physical processes effecting on the evolution of the gamma-ray burst afterglow are presented.

关 键 词：Gamma暴 余辉 相对论流体动力学 同步加速辐射 光变曲线 火球 

分 类 号：P142[天文地球—天体物理]