共动坐标系中伽玛暴νF_ν谱的峰值能量分布

The Peak Energy Distribution of the νF_ν Spectra in the Rest Frame

伽玛暴能谱νF_ν的峰值能量Ep是伽玛暴一个很重要的观测物理量,各种仪器观测的伽玛暴νF_ν谱的峰值能量Ep分布都很宽。根据初始洛伦兹因子Γ0,把伽玛暴νF_ν谱的峰值能量Ep修正到共动坐标系,发现Ep在不同坐标系中分布的宽窄程度没有显著差别,说明观测的峰值能量Ep分布比较宽应该不是多普勒放大作用,可能是伽玛暴峰值能量Ep的真实分布。

Gamma-ray bursts （GRBs） are the most violent events in the universe. The peak energy of the uFv spectra Ep is an important quantity of the GRBs and it is dramatically different from burst to burst. The energy distribution of Ep is wide, and the distribution profile of the observed Ep from different satellites is without major differences. After calculating the peak energy E＇v = Ep/Гo of the uFv spectra in the jet co- moving frame and comparing the distribution of the Ep in jet-comoving frame and observed frame, we find that the distributions show no significant difference. The result indicates that the wide distribution of the observed Ep may not be govemed by the Doppler boosting effect, rather, it may be the true physical distribution of the peak energy of the GRBs.