发表机构
University of Oxford; McGill University; University of Cape Town（牛津大学; 麦吉尔大学; 开普敦大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究探讨扭折不稳定性作为X射线双星硬态致密喷流中粒子加速的机制，通过一维模型和模拟估算，发现喷流在加速区可能不稳定，并随参数变化影响辐射尺度及爆发周期演化。
AI 中文摘要
我们考虑扭折不稳定性能否解释硬态“致密”X射线双星喷流中的粒子加速。我们应用一维模型评估多种喷流模型下该不稳定性的预期增长率，然后从模拟结果中缩放以估算喷流中磁能的耗散率。随后，我们考虑辐射冷却对系统的影响。我们发现，在合理的参数空间内，硬态“致密”X射线双星喷流在其加速区内很可能对扭折不稳定性不稳定。我们进一步发现，取决于模型参数，喷流可能在多种长度尺度上辐射，范围从可归因于“失败”喷流情景的长度尺度，到与“致密”喷流分辨射电观测一致的长度尺度。我们讨论了该模型在爆发周期中的预期演化。
英文摘要
We consider whether the kink instability can explain particle acceleration in hard state 'compact' X-ray binary jets. We apply a 1D model to assess the expected growth rate of the instability for a variety of jet models, then scale results from simulations to estimate a dissipation rate for the magnetic energy in the jet. We then consider the effects of radiative cooling on the system. We find that hard state 'compact' X-ray binary jets are likely to be unstable to the kink instability within their acceleration zones across a plausible parameter space. We further find that depending on the parameters of the model, the jets may radiate over a variety of length scales ranging from length scales attributable to a 'failed' jet scenario, to those in keeping with resolved radio observations of 'compact' jets. We discuss the expected evolution of this model through the outburst cycle.
