AI 中文总结
本文介绍了CRPropa框架的插件grplinst，用于模拟星系际介质中电磁级联的等离子体不稳定性冷却，以解决级联解释的理论不确定性，助力高能伽马射线观测结果的解读。
AI 中文摘要
遥远耀变体产生的TeV伽马射线引发的电磁级联是探测星系际介质、尤其是星系际磁场最干净的间接手段之一。但由于一个悬而未决的理论问题，其解释并不完全清晰：级联中产生的正负电子束通过集体等离子体过程损失能量的程度。若该过程发生在逆康普顿散射产生次级伽马射线之前，级联将被淬灭。本文提出了CRPropa框架的插件grplinst，用于模拟正负电子在传播过程中受等离子体不稳定性冷却的情况，描述了文献中提出的多种方案的实现方式，并给出了示例。该代码既适用于限定理论不确定性，也可系统研究等离子体不稳定性假设如何影响伽马射线可观测量及推断的星系际磁场约束，这对解释当前及未来高能伽马射线天文台的观测结果至关重要。
英文摘要
Electromagnetic cascades initiated by TeV gamma rays from distant blazars provide one of the cleanest indirect probes of the intergalactic medium and, in particular, of intergalactic magnetic fields. However, their interpretation is not completely clear because of an open theoretical question: the extent to which the electron-positron beams generated in the cascade can lose energy through collective plasma processes. If this occurs before inverse Compton scattering produces secondary gamma rays, then the cascade is quenched. Here we present grplinst, a plugin for the CRPropa framework that models plasma-instability cooling acting on electrons and positrons during propagation. We describe the implementation of several prescriptions proposed in the literature, and present illustrative examples. The code is suitable both for bracketing theoretical uncertainties and for performing systematic studies of how plasma-instability assumptions propagate into gamma-ray observables and inferred intergalactic magnetic-field constraints, which is essential for interpreting current and forthcoming observations by high-energy gamma-ray observatories.
Comments17 pages, 3 figures; submitted to Frontiers in Astronomy and Space Science, research topic: The Role of Plasmas and Cosmic Magnetism in High-energy Astroparticle Physics
