论文标题
从GRB 221009a延迟400 GEV光子，并牵涉到白术磁场
A delayed 400 GeV photon from GRB 221009A and implication on the intergalactic magnetic field
论文作者
论文摘要
自触发器以来，大型高空空气淋浴天文台已检测到GRB 221009a的0.2-13 $ TEV发射。在这里，我们报告了Fermi大面积望远镜在此方向上检测到400 GEV光子，而无需伴随着显着的低能发射，延迟了0.4天。给定与售价约$ 4 \ times 10^{ - 17} $ G的磁场强度与Tev Blazars相当的限制，可以解释为延迟的400 GEV光子，可以解释为约10 TEV Gamma Rays的级联发射。我们估计级联排放的概率可能会导致一个可检测到的光子超过100 GEV，而Fermi大面积望远镜在$ 0.3-1 $ $ $ $ $ $ $ $中的概率约为2 $ \％$，而大约在0.3-2550美元的$ 0.5 $ \％$中。我们的结果表明，Synchrotron自我解释的概率低于$ 3-30 $的概率比级联方案低约3-30美元。
Large High Altitude Air Shower Observatory has detected $0.2-13$ TeV emission of GRB 221009A within 2000 s since the trigger. Here we report the detection of a 400 GeV photon, without accompanying prominent low-energy emission, by Fermi Large Area Telescope in this direction with a 0.4 days' delay. Given an intergalactic magnetic field strength of about $4 \times 10^{-17}$ G, which is comparable to limits from TeV blazars, the delayed 400 GeV photon can be explained as the cascade emission of about 10 TeV gamma rays. We estimate the probabilities of the cascade emission that can result in one detectable photon beyond 100 GeV by Fermi Large Area Telescope within $0.3-1$ days is about 2$\%$ whereas it is about 20.5$\%$ within $0.3-250$ days. Our results show that Synchrotron Self-Compton explanation is less favored with probabilities lower by a factor of about $3-30$ than the cascade scenario.
