Are there cosmological evolution trends on gamma-ray burst features?
Are there cosmological evolution trends on gamma-ray burst features?
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DOI：
10.1046/j.1365-8711.2003.06971.x
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发表时间：
2002-12
影响因子：
4.8
通讯作者：
D. Wei;W. Gao
中科院分区：
文献类型：
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作者：
D. Wei;W. Gao
伽玛射线暴（GRB）的变化被认为与它的绝对峰值亮度相关，并且这种关系已经被用来推导GRB红移的估计。最近，Amati等人给出了几个已知红移的伽玛暴的光谱和能量性质的结果。在这里，我们分析了两组伽玛暴的性质：一组已知的红移余辉观测和另一组的红移来自光度-变化关系。我们研究了宇宙学静止坐标系中各种伽玛暴特征的红移依赖性，包括暴的持续时间、各向同性的亮度和辐射能量以及nuF（nu）谱的峰值能量E-p。我们发现，这两类伽玛暴的性质都与红移有关，即它们的内禀持续时间、亮度、辐射能量和峰值能量E-p都与红移有关，这意味着伽玛暴的性质存在宇宙学演化效应，这为伽玛暴的性质提供了一条有趣的线索。如果这是真的，那么这些结果也意味着由光度-变率关系导出的红移是可靠的。
The variability of a gamma-ray burst (GRB) is thought to be correlated with its absolute peak luminosity, and this relation had been used to derive an estimate of the redshifts of GRBs. Recently, Amati et al. presented the results of spectral and energetic properties of several GRBs with known redshifts. Here, we analyse the properties of two groups of GRBs: one group with known redshift from afterglow observation and another group with redshift derived from the luminosity-variability relation. We study the redshift dependence of various GRBs features in their cosmological rest frames, including the burst duration, the isotropic luminosity and radiated energy, and the peak energy E-p of nuF(nu) spectra. We find that, for these two groups of GRBs, their properties are all redshift-dependent, i.e. their intrinsic duration, luminosity, radiated energy and peak energy E-p are all correlated with the redshift, which means that there are cosmological evolution effects on gamma-ray burst features, and this can provide an interesting clue to the nature of GRBs. If this is true, then the results also imply that the redshift derived from the luminosity-variability relation may be reliable.