逆康普顿散射对γ暴余辉的影响(英文)  

THE EFFECT OF ICS ON GRB AFTERGLOWS

作　　者：韦大明[1] 

机构地区：[1]中国科学院紫金山天文台,南京210008

出　　处：《紫金山天文台台刊》1999年第3期293-298,共6页

摘　　要：γ暴余辉的发现是γ暴研究史上的一个重大突破，火球模型几乎可以较好地解释γ暴余辉的观测特性。但在标准的火球模型中，通常只考虑电子的同步加速辐射，没有考虑电子逆康普顿散射的贡献。这里我们详细计算了逆康普顿散射对γ暴余辉的影响，发现在一定的条件下，逆康普顿散射的影响是很重要的，它可以显著地改变辐射能谱，进而改变γ暴余辉的光变特性。The detection of delayed X ray, optical and radio emission, “afterglow”, associated with γ ray bursts (GRBs) is consistent with fireball models, where the emission is produced by relativistic expanding blast wave, driven by expanding fireball at cosmogical distances. The emission mechanisms of GRB afterglow have been discussed by many authors and synchrotron radiation is believed to be the main mechanism. The observations show that the optical light curves of two observed gamma ray bursts, GRB970228 and GRB970508, can be described by a simple power law, which seems to support the synchrotron radiation explanation. However, here we shall show that under some circumstances, the inverse Compton scattering (ICS) may play an important role in emission spectrum and this may influence the temporal properties of GRB afterglow. We expect that the light curves of GRB afterglow may consist of multi components, which depends on the fireball parameters.

关 键 词：辐射机制 逆康普顿散射 γ暴余辉 火球模型 

分 类 号：P142.82[天文地球—天体物理]