长γ暴时域功率密度谱与光度的强相关  

Strong Correlation between the Peak Power Density in Time Domain and the Luminosity of Long γ Ray Bursts

作　　者：杨曌宇[1] 宋黎明[1] 申荣锋[1] 黎卓[1] 吕雨生[1] 

机构地区：[1]中国科学院高能物理研究所粒子天体物理重点实验室,北京100049

出　　处：《天文学报》2005年第2期117-124,共8页Acta Astronomica Sinica

基　　金：国家自然科学基金(10473010)资助项目

摘　　要：提供一个基于光变曲线的长γ暴光度的估计量.对BASTE记录到的12个已知红移的γ暴,利用时域上的时变分析方法计算了各暴的功率密度谱,用功率密度的峰值P表征光变曲线变化的剧烈程度.通过拟合发现在共动坐标系P与γ暴的各向同性峰值光度L之间存在着相关关系.这是继Norris等和Reichart等发现时间延迟与光度、变化率与光度的相关性之后又一个γ暴时变特征量与其光度之间的相关关系.This work presents a possible luminosity estimator for the long gamma-ray bursts based on the light curves. We use the methods of temporal variability analysis in time domain to calculate the power density spectrum (PDS) of the 12 7-ray bursts (GRBs) with known redshifts observed by CGRO/BATSE. The peak of the power density P measures the variability intensity of each light curve and a strong correlation is found between P and the isotropic peak luminosity L. It's a new relationship between the temporal quantities and the luminosities of long GRBs, succeeding the lag-luminosity relation suggested by Norris et al.(2000) and variability-luminosity relation shown by Reichart et al. (2001).

关 键 词：长γ暴 时域功率密度谱 光度 强相关 

分 类 号：P172[天文地球—天文学]