摘要
本文在考虑辐射损失情况下,认为由磁场重连这种加速机制所产生的沿磁场成束的粒子系的同步辐射是γ射线爆的主要辐射机制.在此模型的基础上,满意地拟合了具有强烈谱变的GB 820828三个连续能谱以及N_(14)(150—700keV/N_(13)(40 keV—180 keV)的演化关系.
In this article, magnetic reconnection caused by the instability of neutron star magnetosphere has been proposed as the electron acceleration mechanism in Gamma-ray bursts(GRBs). The beamed relativistic electrons accelerated directly by the acceleration mechanism inpulsively eject from the magnetic reconnection region approximately in the line of the magnetic field direction These electrons emit photons through synchrotron radiation and lose energy. The synchrotron radiation spectrum has been calculated, including the radiation loss. This kind of spectrum form is different from the known form of synchro tron radiation and satisfactorily fits the three successive continuum spectra and the time evolution of N_(14) (150—700KeV)/N_(13) (40—180KeV) in GB820828 showing remarkable spectral variability. Also the radiation mechanism can reasonably explain the common characteristics, i.e., the absorption and emission features only appear at the beginning of GRBs with fast spectral variability.
出处
《天文学报》
CSCD
北大核心
1992年第3期309-315,共7页
Acta Astronomica Sinica
基金
国家自然科学基金
关键词
Γ射线爆
磁重连
谱变
成束粒子系
Gamma-Ray Bursts—Magnetic Reconnection—Spectral Variability
