再探伽玛射线暴中能量与脉冲宽度的依赖关系

探索来源于BATSE(http://cossc:gsfc:nasa:gov/batse)的GRB(Gamma-Ray Burst,伽玛射线暴)观测数据的半峰宽度(FWHM)与能量之间的关系,基于64个用KRL函数模型(即,文1]中的(22)式)能很好地拟合的FRDE(Fast Rise and Exponential Decay,快速上升指数下降)型脉冲样本。发现64个样本中有63个的半峰宽度(FWHM)与能量之间的关系属于平台—幂率—平台型结构或峰型结构。64个样本的半峰宽度(FWHM)与能量之间的关系在观测中可详细分为5种类型:a)有34个样本为幂率形式关系;b)18个样本为低能段平台关系;c)有7个样本为高能段平台关系;d)4个样本为峰型结构关系;e)另外有1个样本为其他结构。结果表明:GRB观测数据的半峰宽度(FWHM)与能量之间的确存在有幂率的关系。此结果进一步确认了文2](Qin etal 2005)的观点,即半峰宽度(FWHM)与能量之间的关系是由于火球模型的多普勒效应(Doppler effect)导致的。

Revisite of the Energy Dependence on the Pulse Width in Gamma-Ray Bursts

The relationship between the pulse FWHM (full-widths at half maximum) and the energy of gamma-ray bursts (GRBs) is explored based on the observed data from BATSE data base (http:cossc:gsfc:nasa:gov/atse/). Based on a sample of 64 FRED (fast rise and exponential decay) pulse bursts better fitted with the KRL model ( refer equation (22) in1]), it is found that 63,out of the 64 sources, belong to either the platform-power-law-platform feature class or the peaked feature group. The classifications for 64 sources could be sorted into five models in detail: a) a power law range could be observed in 34 sources; b) a lower band platform could be observed or suspected in 18 bursts; c) a higher band platform could be observed or suspected in 7 sources; d) a peaked feature could be observed or suspected in 4 GRBs; e) the other model from the four types above could be observed in 1 sources. The result suggests that there exists a power law relationship between the pulse FWHM of GRBs and the energy. And the result confirms the points from Qin et al (2005)2]that the relationship is due to the Doppler effect of fireballs.