伽玛暴X射线余辉中的快速衰减与曲率效应

快速衰减成分是伽玛射线暴的标准余辉模型的成分之一.大部分X射线余辉样本中都显现有快速衰减成分.对快速衰减成分的研究,有助于我们对伽玛暴的认识.目前普遍认为快速衰减成分是来自于激波的高纬度辐射.对快速衰减成分的衰减斜率和瞬时辐射的各向总能量之间关系进行研究,我们发现它们之间存在很强的相关性,其相关关系的斜率大约为0.15;瞬时辐射的能量越大,其快速衰减成分衰减的越快,高纬度辐射的越明显;该结果支持了快速衰减成分是由激波的高纬度辐射所引起的结论.

Steep Decay and Curvature Effect of Afterglow in X-ray

Generally,the component due to the steep decay is one of component of afterglow in the Gamma-ray burst. The component by the steep decay is usually appeared in the afterglow of the X-ray. The research of the steep decay will help us understand the physics of GRBs. At present,the steep decay is generally considered from the high-latitude radiation of shock. Analyzing the relationship between the isotropic total energy of prompt emission and slope of steep decay,we find that there is a strong correlation between them and the index of correlation is about 0. 15. The greater the energy is,the faster the steep decay is,and the more obvious the high-latitude radiation becomes. The results that we obtain support that the component due to the steep decay is caused by the shock wave from high latitude radiation.