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arXiv 1307.7293astro-ph.HE
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伽玛暴X射线余辉的亮度和时间演化研究

Study of luminosity and time evolution in X-ray afterglows of GRBs

Maria Giovanna Dainotti, Vahe' Petrosian, Jack Singal, Michal Ostrowski

摘要:

伽马射线暴(GRB),已被观测到的红移高达$z \approx 9.5$,可以是早期宇宙的很好的探针,并有可能测试宇宙学模型。Dainotti对具有已知红移和确定的X射线平台的GRB雨燕余辉光变曲线的分析表明,平台结束时的\underline{rest frame}时间(平台结束时间)与当时计算的光度之间存在反相关(或平台持续时间与光度之间近似存在反相关)。我们在这里提出了一个更新的相关性与一个更大的数据样本的101个伽玛暴具有良好的光变曲线。由于这种相关性的一些可能会导致这些内在参数的红移依赖性,即它们的宇宙学演化,我们使用Efron-Petrosian方法来估计光度和时间演化,并纠正这种影响,以确定这种相关性的内在性质。

英文摘要:

Gamma-ray bursts (GRBs), which have been observed up to redshifts $z \approx 9.5$ can be good probes of the early universe and have the potential of testing cosmological models. The analysis by Dainotti of GRB Swift afterglow lightcurves with known redshifts and definite X-ray plateau shows an anti-correlation between the \underline{rest frame} time when the plateau ends (the plateau end time) and the calculated luminosity at that time (or approximately an anti-correlation between plateau duration and luminosity). We present here an update of this correlation with a larger data sample of 101 GRBs with good lightcurves. Since some of this correlation could result from the redshift dependences of these intrinsic parameters, namely their cosmological evolution we use the Efron-Petrosian method to estimate the luminosity and time evolution and to correct for this effects to determine the intrinsic nature of this correlation.

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