Recent multiwavelength observations of gamma-ray burst afterglows observed in the TeV energy range challenge the simplest synchrotron self-Compton (SSC) interpretation of this emission and are consistent with a single power-law component spanning over 8 orders of magnitude in energy. To interpret this generic behavior in the single-zone approximation without adding further free parameters, we perform an exhaustive parameter space study using the public, time-dependent, multimessenger transport software AM3. This description accounts for the radiation from nonthermal protons and the leptohadronic cascade induced by pp and pγ interactions. We summarise the main scenarios that we have found (SSC, Extended-syn, Proton-syn, pp-cascade, and pγ-cascade) and discuss their advantages and limitations. We find that possible high-density environments, as may be typical for surrounding molecular cloud material, offer an alternative explanation for producing flat hard (source) spectra up to and beyond energies of 10 TeV.

中文翻译：

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伽马射线暴余辉光谱 TeV 扩展的软面体情景


最近在 TeV 能量范围内观察到的伽马射线暴余辉的多波长观测挑战了该发射的最简单同步加速器自康普顿 （SSC） 解释，并且与能量跨越超过 8 个数量级的单个幂律分量一致。为了在不添加更多自由参数的情况下在单区近似中解释这种通用行为，我们使用公共的、依赖于时间的多信使传输软件 AM3 进行了详尽的参数空间研究。该描述解释了来自非热质子的辐射以及 pp 和 pγ 相互作用诱导的软面子级联反应。我们总结了我们发现的主要场景（SSC、Extended-syn、Proton-syn、pp-cascade 和 pγ-cascade），并讨论了它们的优点和局限性。我们发现，可能的高密度环境（如周围分子云材料的典型环境）为产生高达 10 TeV 能量及以上的平坦硬（源）光谱提供了另一种解释。