γ射线暴火球模型的光学余辉辐射  

Radiation mechanism of GRB optical after-glows

作　　者：倪霓[1] 李若虹[1] 杨丕博[1] 

机构地区：[1]华中师范大学物理系,武汉430079

出　　处：《华中师范大学学报（自然科学版）》2001年第1期30-32,共3页Journal of Central China Normal University：Natural Sciences

基　　金：国家自然科学基金项目!(1 97730 0 3

摘　　要：按照γ射线暴火球模型的动力学演化规律 ,利用相对论电子在磁场中作同步加速辐射时谱分布的特点 ,用求峰值频率辐射的方法 ,计算了 γ射线暴红光波段余辉辐射流量随时间的变化 .与γ射线暴 GRB970 2 2 8的观测结果比较 ,符合甚好 ,说明同步加速辐射是γ射线暴余辉主要的辐射机制 。According to the dynamics evolution rule of GRB in the model of fireballs, and using the charactenistic of the spectra distribution of ultrarelative electron in magnetic field as well as the methord of the radiation in peak frequency,we calculate the variation of the R- band flux density of GRB after- glows with time,which is very consistent with observed spectra of GRB970 0 2 8. Our result implys that synchrotron radiation is main mechanism of Gramma- ray bursts after- glows,and proves the validity of the model of fireballs.

关 键 词：Γ射线暴 火球模型 同步加速辐射 光学余辉辐射 动力学演化规律 辐射机制 

分 类 号：P142.82[天文地球—天体物理]