论文标题
GRB迅速发射的时间分辨和能量分辨极化
Time-Resolved and Energy-Resolved Polarizations of GRB Prompt Emission
论文作者
论文摘要
除了光曲线和光谱外，极化还提供了研究$γ-$ ray Burst（GRB）及时阶段的不同强大工具。与时间集成和能量集成的极化相比，时间分辨和能量分辨的极化可以提供有关发射区域的更多物理信息。在这里，我们研究了使用同步加速器模型的时间分辨和能量分辨的极化。我们发现，当发射区域的物理条件随半径剧烈变化时，相等的到达时间表面效应对于塑造PD曲线非常重要。极化特性既不与光谱滞后也不相关，也不相关。具有混合磁场的极化特性与相应有序磁场的极化特性非常相似，但前者具有较小的极化度。 MEV峰处的发射对于同步加速器模型可以高度极化，而耗散光球模型的预测则不偏振。未来能源分辨的极化观测可以区分这两个模型。
Besides light curves and spectra, polarization provides a different powerful tool of studying the $γ-$ray burst (GRB) prompt phase. Compared with the time-integrated and energy-integrated polarization, time-resolved and energy-resolved polarization can deliver more physical information about the emitting region. Here we investigate time-resolved and energy-resolved polarization of GRB prompt emission using the synchrotron models. We find that the equal arrival time surface effect is very important in shaping the PD curves when the physical conditions of emitting region changes violently with radius. Polarization properties are neither correlated with the spectral lag nor the peak energy evolution patterns. Polarization properties with a mixed magnetic field are very similar to those for a corresponding ordered magnetic field but the former has a smaller polarization degree. The emission at the MeV peak can be highly polarized for a synchrotron model while it is unpolarized as predicted by a dissipative photosphere model. Future energy-resolved polarization observations can distinguish between these two models.
