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Relative Spectral Lag: a New Redshift Indicator of Gamma-ray Bursts

机译:相对光谱滞后:伽马射线暴的新红移指标

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摘要

Using 64 ms count data of long gamma-ray bursts (T_(90) > 2.6 s), we analyze the quantity named relative spectral lag (RSL), τ_(31)/FWHM_((1)). We investigated in detail all the correlations between the RSL and other parameters for a sample of nine long bursts, using the general cross-correlation technique that includes the lag between two different energy bands. We conclude that the distribution of RSLs is normal and has a mean value of 0.1; that the RSLs are weakly correlated with the FWHM, the asymmetry, peak flux (F_p), peak energy (E_p) and spectral indexes (α and β), while they are uncorrelated with τ_(31), the hardness-ratio (HR_(31)) and the peak time (t_m). Our important discovery is that redshift (z) and peak luminosity (L_p) are strongly correlated with the RSL, which can be measured easily and directly, making the RSL a good redshift and peak luminosity indicator.
机译:使用长伽马射线暴(T_(90)> 2.6 s)的64 ms计数数据,我们分析了称为相对光谱滞后(RSL)的量τ_(31)/ FWHM _((1))。我们使用包括两个不同能带之间的滞后的通用互相关技术,对九个长脉冲串样本的RSL和其他参数之间的所有相关性进行了详细调查。我们得出的结论是,RSL的分布是正态的,平均值为0.1。 RSL与FWHM,不对称性,峰值通量(F_p),峰值能量(E_p)和光谱指数(α和β)弱相关,而与τ_(31),硬度比(HR_( 31))和高峰时间(t_m)。我们的重要发现是,红移(z)和峰值光度(L_p)与RSL密切相关,可以轻松,直接地对其进行测量,从而使RSL成为良好的红移和峰值光度指标。

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