论文标题
SGR J1935+2154及其环境的高能伽马射线排放的更新视图和观点
An updated view and perspectives on high-energy gamma-ray emission from SGR J1935+2154 and its environment
论文作者
论文摘要
SGR J1935+2154于2016年发现，目前是最突发的软伽马射线中继器（SGR）之一，近年来发出了几次X射线爆发。在以前的一篇文章中，我们研究了由于SNR G57.2+0.8托管SGR J1935+2154的宇宙射线加速度，使用Galprop Prop Prop Propation Code，由于宇宙射线加速度加速了高能和非常高能量的伽马射线排放（VHE，$ e> 100 $ GEV）。但是，使用高能量立体镜系统（H.E.S.S.），于2020年4月28日对SGR 1935+2154进行了随访观察。观察结果与通过积分和费米/伽马射线爆发监视器（GBM）检测到的X射线爆发一致。这些是在耀斑状态下对SGR的第一个高能量伽马射线观测值，并且已经得出了持续和瞬态发射的上限。现在新的H.E.S.S.已经进行了观察，更新我们的模型对这些新的上限很有趣。我们使用新版本的GalProp将先前的结果扩展到更一般的情况。我们获得了H.E.S.S ..所讨论的结果，这导致了一个乐观的前景，即SGR J1935+2154的宇宙射线伽玛射线可以有助于总体伽马能密度分布，尤其是从Galactic Center的扩散Gamma射线。
SGR J1935+2154 was discovered in 2016 and is currently one of the most burst-active Soft Gamma-ray Repeaters (SGR), having emitted several X-ray bursts in recent years. In one of our previous articles, we investigated the contribution to high-energy and very high-energy gamma-ray emission (VHE, $E > 100$ GeV) due to cosmic-ray acceleration of SNR G57.2+0.8 hosting SGR J1935+2154 using the GALPROP propagation code. However, follow-up observations of SGR 1935+2154 were made for 2 hours on April 28, 2020, using the High Energy Stereoscopic System (H.E.S.S.). The observations coincide with X-ray bursts detected by INTEGRAL and Fermi/Gamma-ray Burst Monitor (GBM). These are the first high-energy gamma-ray observations of an SGR in a flaring state, and upper limits on sustained and transient emission have been derived. Now that new H.E.S.S. observations have been made, it is interesting to update our model with respect to these new upper limits. We extend our previous results to a more general situation using the new version of GALPROP. We obtain a hadronic model that confirms the results discussed by H.E.S.S.. This leads to an optimistic prospect that cosmic ray gamma rays from SGR J1935+2154 can contribute to the overall gamma energy density distribution and in particular to the diffusion gamma rays from the Galactic center.
