论文标题
与观察到的能量光谱的伽马射线爆发及时发射的时间分辨极化
Time-resolved polarizations of gamma-ray burst prompt emission with observed energy spectra
论文作者
论文摘要
时间分辨的极化具有更多的物理信息，以涉及伽马射线爆发的来源（GRB），而不是时间集成。因此，它们对GRB及时阶段的模型更加严格。在这里考虑了时间分辨和时间集成的极化。我们使用的模型是在大规模有序排列磁场中的同步加速器发射。与相应的时间分辨能光谱得出GRB及时相位的时间分辨极化。我们发现用两种方法计算的时间集成的PD相似。因此，通过时间集成的能量光谱估算时间集成的PD很方便。本文计算出的大多数时间分辨PD都会随着时间而增加。该趋势可能与观察到的GRB 170114a的时间分辨PD曲线相匹配，但与磁性内部冲击和磁重新连接模型的衰减PD的预测相反。通常，在本文中计算出的PA是随时间的大致常数。这里预测的PA与GRB 100826A和GRB 170114a中观察到的暴力PA变化无法匹配。因此，需要更准确的时间分辨极化观察来测试模型并诊断GRB及时阶段的真实物理过程。
Time-resolved polarizations carry more physical information about the source of gamma-ray bursts (GRBs) than the time-integrated ones. Therefore, they give more strict constrains on the models of GRB prompt phase. Both time-resolved and time-integrated polarizations are considered here. The model we use is the synchrotron emission in a large-scale ordered aligned magnetic field. Time-resolved polarizations of GRB prompt phase are derived with the corresponding time-resolved energy spectra. We found the time-integrated PDs calculated with two methods are similar. So it is convenient to estimate the time-integrated PD by the time-integrated energy spectrum. Most of the time-resolved PDs calculated in this paper will increase with time. The trend could match the observed time-resolved PD curve of GRB 170114A, but contrary to the predictions of a decaying PD of both the magnetized internal shock and magnetic reconnection models. PAs calculated in this paper, in general, are roughly constants with time. The predicted PAs here can not match with the violent PA changes observed in GRB 100826A and GRB 170114A. Therefore, more accurate time-resolved polarization observations are needed to test models and to diagnose the true physical process of GRB prompt phase.
