AGN中的曲率漂移不稳定性
Centrifugally induced curvature drift instability in AGN
摘要：
我们研究了离心驱动的曲率漂移不稳定性，以研究磁力线如何在活动星系核的轻圆柱表面附近扭曲，通过这种扭曲可以监测活动星系核风的自由运动。通过研究轻圆柱表面附近的相对论性MHD流的动力学，采用基于离心加速度的单粒子方法，推导并解析求解了不稳定性的色散关系。考虑到AGN风的典型值，结果表明，曲率漂移不稳定性的时间尺度远小于吸积过程的时间尺度，表明目前的不稳定性是非常有效的，可能会强烈影响AGN等离子体中的过程。
英文摘要：
We investigate the centrifugally driven curvature drift instability to study how field lines twist close to the light cylinder surface of an AGN, through which the free motion of AGN winds can be monitored. By studying the dynamics of the relativistic MHD flow close to the light cylinder surface, we derive and solve analytically the dispersion relation of the instability by applying a single particle approach based on the centrifugal acceleration. Considering the typical values of AGN winds, it is shown that the timescale of the curvature drift instability is far less than the accretion process timescale, indicating that the present instability is very efficient and might strongly influence processes in AGN plasmas.
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