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arXiv 0707.0627astro-ph
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长滞后宽脉冲伽马射线暴的时间特性与能量的关系

Dependence of Temporal Properties on Energy in Long-Lag, Wide-Pulse Gamma-Ray Bursts

Fu-Wen Zhang, Yi-Ping Qin, Bin-Bin Zhang

摘要:

我们采用Norris等人(2005,ApJ,625,324)编制的样本来研究长滞后、宽脉冲伽马射线暴中脉冲时间特性对能量的依赖性。我们的分析表明,脉冲的峰值时间、上升时间和衰减时间都是能量的幂律函数,这是对这三个量与能量关系的初步报道。与脉冲宽度、上升时间尺度和衰减时间尺度相关的幂律指标之间存在相关性,其中与脉冲宽度和衰减时间尺度相关的幂律指标之间的相关性更明显。此外,我们还发现脉冲峰值滞后与CCF滞后有很强的相关性,而质心滞后与峰值滞后和CCF滞后的相关性较小。基于这些结果和以前的一些研究,我们倾向于认为所有与能量相关的脉冲时间特性可能来自流出水动力过程和曲率效应的共同贡献,其中与能量相关的谱滞后可能主要由动力学过程决定,而与能量相关的脉冲宽度可能主要由曲率效应决定。

英文摘要:

We employed a sample compiled by Norris et al. (2005, ApJ, 625, 324) to study the dependence of the pulse temporal properties on energy in long-lag, wide-pulse gamma-ray bursts. Our analysis shows that the pulse peak time, rise time scale and decay time scale are power law functions of energy, which is a preliminary report on the relationships between the three quantities and energy. The power law indexes associated with the pulse width, rise time scale and decay time scale are correlated and the correlation between the indexes associated with the pulse width and the decay time scale is more obvious. In addition, we have found that the pulse peak lag is strongly correlated with the CCF lag, but the centroid lag is less correlated with the peak lag and CCF lag. Based on these results and some previous investigations, we tend to believe that all energy-dependent pulse temporal properties may come from the joint contribution of both the hydrodynamic processes of the outflows and the curvature effect, where the energy-dependent spectral lag may be mainly dominated by the dynamic process and the energy-dependent pulse width may be mainly determined by the curvature effect.

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