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arXiv 0810.0371astro-ph
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GRB余辉的光度作为距离估计量

The luminosity of GRB afterglows as distance estimator

B. Gendre, A. Galli, M. Boer

摘要:

我们研究了在X射线和光学波长下观察到的余辉光变曲线的聚类。我们构造了一个已知距离和X射线余辉的61个爆发样本。伽玛暴源可分为三类,即光学和X射线亮余辉、光学和X射线暗余辉以及光学亮X射线暗余辉。我们认为这种聚集与火球的总能量、外部介质密度、火球能量在相对论电子和磁场中所占的比例有关。本文提出了一种根据暴后一天观测到的d射线通量和光学性质估算伽玛暴源红移的方法。我们用这种方法对最近探测到的三个已知红移的SWIFT伽玛暴进行了测试,发现它与光谱学报道的距离很好地吻合。

英文摘要:

We investigate the clustering of afterglow light curves observed at X-ray and optical wavelengths. We have constructed a sample of 61 bursts with known distance and X-ray afterglow. GRB sources can be divided in three classes, namely optical and X-ray bright afterglows, optical and X-ray dim one s, and optically bright -X-ray dim ones. We argue that this clustering is related to the fireball total energy, the external medium density, the fraction of fireball energy going in relativistic electrons and magnetic fields. We propose a method for the estimation of the GRB source redshift based on the observe d X-ray flux one day after the burst and optical properties. We tested this method on three recently detected SWIFT GRBs with known redshift, and found it i n good agreement with the reported distance from optical spectroscopy.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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