Fermi/GBM伽马暴的谱能关系

On the Spectra-energy Relation in Fermi/GBM Gamma-ray Bursts

选取10个已知红移的单峰Fermi/GBM长暴,采用交叉相关函数计算第1与第3能道之间的相对能谱延迟(R_(SL)).研究发现,伽马暴的R_(SL)s分别与峰值光度和红移相关,所得结果与已报道文献中利用BATSE暴得到的结果相符合.这意味着R_(SL)与峰值光度和红移的相关关系不受探测仪器选择效应的影响.这表明R_(SL)可以作为一个可能的宇宙红移探测指示器用于宇宙学参数的测量.利用这些Fermi/GBM伽马暴样本,通过重新分析发现峰值能量与峰值光度、各向同性能存在较强相关.这些关系与从BATSE暴中得到的结果不一致,而与从Swift暴得到的结果符合.

Selecting 10single-pulsed Fermi/GBM long gamma-ray bursts with known redshift,we use cross-correlation function（CCF）to calculate the relative spectral lag（R（SL））between energy channels 1and 3.We find that the R（SL）sare respectively correlated with the peak luminosity and the redshift of gammaray bursts,which is consistent with that of BATSE gamma-ray bursts.This shows that correlations of R（SL） with the peak luminosity and the redshift are not affected by the so-called selection effect of different detectors.It also suggests that the R（SL）can be applied as a reliable indicator to measure the basically cosmological param-eters.With the same Fermi/GBM sample,we re-analyze the correlations of peak energy with peak luminosity and isotropic energy and find that they are tightly correlated.Interestingly,these relations are inconsistent with those obtained with BATSE GRBs but consistent with those of Swift GRBs.