标题： GRB 060729余辉中的长期连续能量注入 显示英文标题

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

摘要： 在GRB 060729的X射线余辉中观察到了一个很长的平台期和惊人的亮度。这种特殊的光变曲线很可能是外部冲击波长期能量注入的结果。在这里，我们详细研究了强磁化毫秒脉冲星磁偶极辐射的能量注入过程，并用多波段余辉观测数据对该模型进行了拟合。结果表明，该模型能够成功解释观测到的X射线和光学余辉光变曲线中的长平台期。平台期后的急剧下降应该是由于中心脉冲星发射功率的快速衰减所致。在更晚的时间（~5×10^6秒），出现了一个明显的喷流断层，这表明GRB喷出物的半张角θ约为0.3，相对较大。由于能量注入，喷流的洛伦兹因子在GRB触发后超过10^7秒仍然大于2，使这次爆发的X射线余辉甚至在爆发后642天仍可被钱德拉望远镜探测到。 显示英文摘要

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.