伽马射线暴的光度-光变复杂度关系

The Correlation Between Variability and Luminosity for the Long Gamma-Ray Bursts

伽马射线暴的光变复杂度是描述其光变曲线复杂程度的物理量。由已知红移的伽马射线暴,Reichart等人发现其光变复杂度与各向同性光度之间有正相关性（L∝V~α,α在1.77～3.5之间）,即光变越复杂,光度越高。此相关性类似于造父变星的周光关系,可用来估计伽马暴的距离和红移。调研、分析了各种光变复杂度的定义、算法和光变复杂度各向同性光度关系的拟合结果,最后对光变复杂度和光度之间的关系做了总结和展望。

The variability of Gamma-ray Burst is a quantitative measure of whether its light curve is spiky or smooth.From the detected spectroscopic redshift,peak fluxes,and high-resolution light curves of long Gamma-ray Burst,it was found that the isotropic peak luminosity positively correlate with the variability of light curves：the more variable bursts（with larger V） tend to have higher intrinsic isotropic luminosities L.This correlation was originally found by Reichart et al.using a sample of 18 Gamma-ray Bursts.In this paper,the definition and algorithm of variability are detailedly investigated and analyzed.The V-L correlation and fitting results are also listed.If L-V relation can be confirmed,it can be adopted as rough distance indicators and redshift estimators of a Gamma-ray Burst from parameters measured merely at gamma-ray prompt emission and it can be used to constrain cosmological parameters.