AI 中文总结
该研究通过相对论磁流体动力学模拟结合同步辐射冷却，探究高能天体物理系统中湍流与辐射的关联，发现模拟结果与快速射电暴等天体观测定性相似，揭示湍流在高能天体源辐射及传播效应中的重要作用。
AI 中文摘要
许多高能天体物理系统中的相对论磁化等离子体兼具湍流性与强辐射性，但其非线性动力学与辐射效应仍未被充分理解。本文呈现相对论磁流体动力学框架下引入同步辐射冷却的三维受迫湍流模拟结果，从模拟湍流中计算法拉第旋转量、合成同步辐射光谱与线性偏振图。湍流驱动的能量注入与同步辐射冷却的平衡使等离子体平均保持相对论高温，进而影响旋转量；同步辐射冷却触发热不稳定性，驱动等离子体进入热稀相与冷密相，增强同步辐射的时空变异性，尤其在高频段。这些诊断结果与快速射电暴、脉冲星风星云及 blazar 的观测具有定性相似性，表明湍流可能在塑造高能天体源周围的辐射与传播效应中发挥重要作用。
英文摘要
Relativistic magnetized plasmas in many high-energy astrophysical systems are both turbulent and strongly radiative, yet their nonlinear dynamics and radiative outcomes remain poorly understood. Here we present results from three-dimensional driven turbulence simulations in relativistic magnetohydrodynamics with synchrotron cooling. We compute Faraday rotation measures, synthetic synchrotron spectra and linear polarization maps from the simulated turbulence. The balance between energy injection from turbulent driving and synchrotron cooling keeps the plasma, on average, relativistically hot, thereby influencing the rotation measure. Synchrotron cooling triggers the thermal instability and drives the plasma into hot dilute and cold dense phases, which enhances the spatial and temporal variability of synchrotron emission, especially at high frequencies. These diagnostics show qualitative similarities to observations of fast radio bursts, pulsar wind nebulae, and blazars, suggesting that turbulence may play an important role in shaping emission and propagation effects around high-energy sources.
CommentsSubmitted to AAS journal
