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arXiv 0909.5318astro-ph.HE
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GRB 060729余辉的长期连续能量注入

Long-term Continuous Energy Injection in the Afterglow of GRB 060729

Ming Xu, Yong-Feng Huang, Tan Lu

摘要:

在GRB 060729的X射线余辉中观察到了一个长的坪相和惊人的亮度。这种奇特的光变曲线可能是由于外部冲击的长期能量注入。本文对强磁化毫秒脉冲星磁偶极辐射的能量注入过程进行了详细的数值研究,并模拟了多波段余辉观测。结果表明,该模型能较好地解释X射线和光学余辉光变曲线中的长平台现象。高原期之后的突变应该是由于中心脉冲星发射功率的迅速下降。在更晚的时间(~5*10^6s),出现了一个明显的喷流中断,这意味着伽玛暴喷出物有一个相对较大的半张角θ ~0.3。由于能量的注入,外流的洛伦兹因子仍然大于伽玛暴触发后的两个10 ^7秒,使得钱德拉在爆发后642天仍能探测到爆发的X射线余辉。

英文摘要:

A long plateau phase and an amazing brightness have been observed in the Xray afterglow of GRB 060729. This peculiar light curve is likely due to long-term energy injection in external shock. Here we present a detailed numerical study on the energy injection process of magnetic dipole radiation from a strongly magnetized millisecond pulsar and model the multi-band afterglow observations. It is found that this model can successfully explain the long plateaus in the observed X-ray and optical afterglow light curves. The sharp break following the plateaus should be due to the rapid decline of the emission power of the central pulsar. At an even late time (~5*10^6s), an obvious jet break appears, which implies a relatively large half opening angle of theta~0.3 for the GRB ejecta. Due to the energy injection, the Lorentz factor of the outflow is still larger than two 10^7s post the GRB trigger, making the X-ray afterglow of this burst detectable by Chandra even 642 days after the burst.

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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