论文标题
GRB 980425/SN 1998BW的延迟teraelectronvolt发射和超高能量宇宙射线的起源
Delayed teraelectronvolt emission from GRB 980425/SN 1998bw and the origin of ultra-high-energy cosmic rays
论文作者
论文摘要
超高能量宇宙射线（UHECRS，E $> 10^{18} $ eV）的起源是现代天体物理学的最大奥秘之一。有人建议在伽马射线爆发（GRB）和发动机驱动的超新星（SNE）中加速UHECR。在这里，我们报告了1.4 TeraelectRonvolt（TEV）光子偏移量0.97 $^{\ Circ} $从附近（36.9 megaparsecs）GRB 980425/SN 1998BW爆炸中发现。在原始GRB 980425/SN 1998BW触发器之后，Fermi Gamma-Ray太空望远镜上的大面积望远镜（LAT）检测到TEV排放。 LAT高银河纬度的TEV检测极为罕见，平均每年有6个事件。我们建议，延迟的TEV发射与GRB 980425/SN 1998BW的超高能量宇宙射线和/或电子峰值对一致。根据TEV排放的到达时间延迟，我们估计订单的IGMF强度$ b \ simeq 10^{ - 12} $ - $ 10^{ - 13} $ GAUSS。该结果支持GRB 980425/SN 1998BW中UHECR加速的可能性，并表明在200 MPC以内的局部GRB/SNE中产生了大多数检测到的UHECR。此外，从UHECRS到0.9-31 GPC的次级光子也可以为Fermi Lat检测到的带能量$ \ geq 1 $ tev的静脉外背景光子提供解释。
The origin of ultra-high-energy cosmic rays (UHECRs, E $> 10^{18}$ eV) is one of the great mysteries of modern astrophysics. It has been suggested that UHECRs could be accelerated in gamma-ray bursts (GRBs) and engine-driven supernovae (SNe). Here we report the discovery of a 1.4 teraelectronvolt (TeV) photon offset 0.97$^{\circ}$ from the site of the nearby (36.9 megaparsecs) GRB 980425/SN 1998bw explosion. The Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope detected the TeV emission on 17 November 2018, more than 20 years after the original GRB 980425/SN 1998bw trigger. TeV detections at high Galactic latitudes by the LAT are extremely rare, with an average of 6 events per year. We propose that the delayed TeV emission is consistent with ultra-high-energy cosmic rays and/or electron-positron pairs from GRB 980425/SN 1998bw being deflected by the intergalactic magnetic field (IGMF) and subsequently cascading into secondary gamma rays. Based on the arrival time delay of the TeV emission, we estimate an IGMF strength of order $B \simeq 10^{-12}$-$10^{-13}$ Gauss. This result supports the possibility of UHECR acceleration in GRB 980425/SN 1998bw and suggests that most detected UHECRs are produced in local GRB/SNe within 200 Mpc. In addition, secondary photons from UHECRs out to 0.9-31 Gpc may also offer an explanation for extragalactic background photons with energies $\geq 1$ TeV detected by the Fermi LAT.
