arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2204.04822astro-ph.HEhep-ph
收藏

GRB 190829 A的甚高能余辉发射:强子起源的证据?

Very High-energy Afterglow Emission of GRB 190829A: Evidence for Its Hadronic Origin?

Sarira Sahu, Isabel Abigail Valadez Polanco, Subhash Rajpoot

摘要:

利用高能体视系统(H.E.S.S.)对GRB 190829A余辉相的多TeV γ射线进行了探测。望远镜是一个除了已经存在的两个以上的伽玛射线暴观察到的非常高的能量(VHE)伽马射线在最近几年的名单。耀变体和伽玛暴的喷流有许多相似之处,光强子模型在解释高能耀变体的VHE γ射线谱方面是非常成功的。最近,光强子模型已经成功地应用于研究GRB 180720 B和GRB 190114 C余辉相的亚TeV γ射线。我们再次用这个模型解释了GRB 190829A连续两夜观测到的VHE谱。我们发现,GRB 190829A的光谱可能是由于高能质子与同步辐射自康普顿光子的相互作用在前激波区的GRB喷流,类似于低发射状态的VHE耀斑事件的高能耀变体。我们推测,如果在未来,有可能观察到VHE伽玛射线光谱从附近的伽玛暴在其余辉阶段,那么其中一些只能通过采用两种不同的光谱指数来解释。如果得到证实,这种VHE光谱可以被解释为高能质子与来自同步加速器背景和前向冲击区同步加速器自康普顿背景的光子相互作用的结果。

英文摘要:

The detection of multi-TeV gamma-rays from the afterglow phase of GRB 190829A by High Energy Stereoscopic System (H.E.S.S.) telescope is an addition to the already existing list of two more GRBs observed in the very high energy (VHE) gamma-rays in recent years. Jets of blazars and GRBs have many similarities and the photohadronic model is very successful in explaining the VHE gamma-ray spectra from the high energy blazars. Recently, the photohadronic model has been successfully applied to study the sub-TeV gamma-rays from the afterglow phases of GRB 180720B and GRB 190114C. We employed this model again to explain the VHE spectra observed for the two consecutive nights from GRB 190829A. We show that the spectra of GRB 190829A can be due to the interactions of high energy protons with the synchrotron self-Compton photons in the forward shock region of the GRB jet, similar to the low emission state of the VHE flaring events of high energy blazars. We speculate that, if in future, it is possible to observe the VHE gamma-ray spectra from nearby GRBs in their afterglow phases, then some of them could only be explained by employing two different spectral indices. If confirmed, such VHE spectra could be interpreted as a result of the interactions of the high energy protons with the photons, both from the synchrotron background and the synchrotron self-Compton background in the forward shock region.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑