论文标题
我们可以从GRB 190114C的非常高能量观测中限制外乳外磁场吗？
Can we constrain the extragalactic magnetic field from very high energy observations of GRB 190114C?
论文作者
论文摘要
来自$γ$ ray爆发（GRB）的初级能量$γ$ - 部分被部分吸收在外层次背景光（EBL）光子上，随后形成了乳层间电磁级联。可观察到的级联$γ$ ray信号的特征对乳层磁场（EGMF）的强度和结构敏感。 GRB 190114c最近用魔术成像大气Cherenkov望远镜检测到，首次允许估计可观察到的级联强度。我们询问是否可以从GRB 190114C上的公共可用$γ$ ray数据获得对EGMF强度和结构的任何限制。我们提供了各种EGMF配置的可观察到的级联信号的详细计算。我们表明，费米 - 拉特空间$γ$ -Ray望远镜的敏感性不足以在EGMF参数上获得此类约束。但是，下一代空间$γ$ - 射线观测器（例如桅杆）将能够检测到与GRB 190114C相似的GRB的配对回波，对于10^{ - 17}的EGMF强度，EGMF的EGHOS - 10^{--10^{ - 18}G。
Primary very high energy $γ$-rays from $γ$-ray bursts (GRBs) are partially absorbed on extragalactic background light (EBL) photons with subsequent formation of intergalactic electromagnetic cascades. Characteristics of the observable cascade $γ$-ray signal are sensitive to the strength and structure of the extragalactic magnetic field (EGMF). GRB 190114C was recently detected with the MAGIC imaging atmospheric Cherenkov telescopes, for the first time allowing to estimate the observable cascade intensity. We inquire whether any constraints on the EGMF strength and structure could be obtained from publicly-available $γ$-ray data on GRB 190114C. We present detailed calculations of the observable cascade signal for various EGMF configurations. We show that the sensitivity of the Fermi-LAT space $γ$-ray telescope is not sufficient to obtain such constraints on the EGMF parameters. However, next-generation space $γ$-ray observatories such as MAST would be able to detect pair echoes from GRBs similar to GRB 190114C for the EGMF strength below 10^{-17}--10^{-18} G.
