1978年3月25日γ射线爆源区特性

THE SOURCE PROPERTIES OF MARCH 25,1978 GAMMA-RAY BURST

釆用3种辐射分量来拟合典型的γ爆GB780325的观测能谱.这3种辐射分量分别是:起源于同一辐射区的同步辐射谱和正负电子对湮灭谱,以及从源区逃逸出来的正电子所形成的成束粒子系的同步辐射谱.由拟合参数,获得以下源区物理特性:磁场B=4.3×10~8T,电子密度n_(?)≈6.12×10^(28)cm^(-3),源区厚度τ≈2.45×10^(-5)cm,源距离d≈0.975Mpc.

The thermal synchrotron radiation spectrum and electronpositron pairs annihilation spectrum, and the synchrotron radiation spectrum from an ensemble of beaming positrons along the magnetic field are used to fit the observed spectrum of the March 25, 1978 gamma-ray burst. From the fit, some parameters discribing the source properties are obtained. The results show that the magnetic field of the source is about 4.3×10~8T; the density of electrons (or positrons) is about 6.12×10^(28) cm^(-3); the thickness of the source is about 2.45×10^(-5)cm; the distance between the source and the Earth is about 0.975Mpc, respectively.