论文标题
GRB及时发射光谱：同步性复仇
GRB Prompt Emission Spectra: The Synchrotron Revenge
论文作者
论文摘要
在发现了40多年后，预测与GRB迅速发射光谱之间的持久张力开始解决。我们发现，如果发射粒子不能完全冷却，则可以通过同步加速器过程产生观察到的光谱。最近在Swift Grbs光谱中发现了不完整冷却的证据，迅速观察到0.5 KEV（Oganesyan等人，2017年，2017年），其特征是额外的低能量中断。为了在更高的能量下搜索这种突破，我们分析了在10年以上的活动中，费米卫星检测到的10个长和10个短的GRB。我们发现，在8/10长的GRB中，有令人信服的证据表明低能破裂（低于峰值能量），而下方和上方的光子指数与同步子光谱（分别为-2/3和-3/2）所预测的值非常一致。分析的十个短GRB都没有显示出突破，但是低能频谱斜率与-2/3一致。在GRB标准模型的框架内，这些结果意味着发射区域中的磁场非常低，这与预期不一致。我还介绍了GRB 190114c的光谱演化，这是第一个通过魔术望远镜检测到的GRB，该GRB具有很高的显着性，该望远镜显示了提示的提示和余滴发射的构成（在KEV-MEV能量范围内），后者升高并占主导地位。
After more than 40 years from their discovery, the long-lasting tension between predictions and observations of GRBs prompt emission spectra starts to be solved. We found that the observed spectra can be produced by the synchrotron process, if the emitting particles do not completely cool. Evidence for incomplete cooling was recently found in Swift GRBs spectra with prompt observations down to 0.5 keV (Oganesyan et al. 2017, 2018), characterized by an additional low-energy break. In order to search for this break at higher energies, we analysed the 10 long and 10 short brightest GRBs detected by the Fermi satellite in over 10 years of activity. We found that in 8/10 long GRBs there is compelling evidence of a low energy break (below the peak energy) and the photon indices below and above that break are remarkably consistent with the values predicted by the synchrotron spectrum (-2/3 and -3/2, respectively). None of the ten short GRBs analysed shows a break, but the low energy spectral slope is consistent with -2/3. Within the framework of the GRB standard model, these results imply a very low magnetic field in the emission region, at odds with expectations. I also present the spectral evolution of GRB 190114C, the first GRB detected with high significance by the MAGIC Telescopes, which shows the compresence (in the keV-MeV energy range) of the prompt and of the afterglow emission, the latter rising and dominating the high energy part of the spectral energy range.
