AI 中文总结
针对TXS 0506+056延迟射电耀发问题，通过构建演化轻子喷流模型，结合多波段数据拟合，揭示初始高能辐射与后续射电活动的因果关系，为相关耀变体喷流研究提供新方法。
AI 中文摘要
耀变体活动星系核（AGN）的喷流具有极强的本征功率和高辐射密度，是强子加速及后续中微子产生的理想场所。IceCube中微子与呈现延迟射电耀发的耀变体（如TXS 0506+056和PKS 1424+240）的潜在关联，为这一情景提供了支持。然而，喷流中粒子加速的机制和位置仍不明确。2017年与TXS 0506+056相关的IceCube事件，与伽马射线耀发的初始峰值同时发生，随后出现持续时间更长的射电耀发，其峰值出现在三年后。最先进的单区辐射源模型聚焦于致密的高能辐射区域，因此无法描述这一后续的射电增强现象。本研究通过考虑沿物理延展喷流的电子辐射，对TXS 0506+056的时域多频演化进行建模；将数值粒子相互作用框架与直至秒差距尺度的喷流时间和空间演化的动态描述相结合，将模型拟合到包括多频射电光变曲线在内的多波段数据。结果表明，秒差距尺度喷流在可观测射电核的边缘附近遇到了一群更古老、冷却的电子，建立了初始高能辐射与后续射电活动之间的因果关系。这种时空分辨的建模方法，可为耀发中微子候选耀变体喷流的物理条件提供新的见解。
英文摘要
The jets of blazar active galactic nuclei (AGN) are promising sites of hadron acceleration and subsequent neutrino production, owing to their extreme intrinsic power and high radiation density. Potential associations of IceCube neutrinos with blazars displaying delayed radio flares, such as TXS~0506+056 and PKS~1424+240, may support this scenario. However, the mechanisms and location of particle acceleration in the jet remain unclear. The 2017 IceCube event associated with TXS 0506+056 was concurrent with the initial peak of a flare in gamma rays, followed by a longer flare at radio frequencies peaking three years later. State-of-the-art single-zone radiative source models focus on the compact high-energy-emitting region, and thus fail to describe this subsequent radio enhancement. In this work, we model the time-domain multi-frequency evolution of TXS 0506+056 by considering electron emission along the physically extended jet. We couple a numerical particle interaction framework with a dynamic description of the temporal and spatial jet evolution down to the parsec scale. We fit the model to multi-wavelength data, including multi-frequency radio light curves. The results suggest that the parsec-scale jet meets a population of older, cooled electrons near the edge of the observable radio core, establishing a causal relation between the initial high-energy emission and trailing radio activity. This spatially and temporally resolved modeling approach can offer new insights into the physical conditions along the jet of flaring neutrino candidate blazars.
Comments18 pages, 7 figures, submitted to PRD
