论文标题
相对论喷气机中回忆不稳定性的磁抑制
Magnetic inhibition of the recollimation instability in relativistic jets
论文作者
论文摘要
在本文中，我们描述了三维相对论磁性水力动力学模拟的结果，旨在探测常规磁场在相对论喷射的回忆伴随不稳定的发展中的作用。特别是，我们研究了由银河冠的热压从活性银河核（AGN）重新启动的回忆。我们发现，使用临界磁化参数$σ_{CR} <0.01 $，相对较弱的方位角磁场可以完全抑制这种喷气机中的回忆不稳定。我们认为，回忆不稳定性是离心不稳定性（CFI）的变体，并表明我们的结果与基于旋转流体中磁CFI的研究的预测一致。总体上讨论了结果，以及尤其是在阿加拉河外无线电源的Fanaroff-riley形态学的性质。
In this paper, we describe the results of three-dimensional relativistic magnetohydrodynamic simulations aimed at probing the role of regular magnetic field on the development of the instability that accompanies recollimation of relativistic jets. In particular, we studied the recollimation driven by the reconfinement of jets from active galactic nuclei (AGN) by the thermal pressure of galactic coronas. We find that a relatively weak azimuthal magnetic field can completely suppress the recollimation instability in such jets, with the critical magnetisation parameter $σ_{cr} < 0.01$. We argue that the recollimation instability is a variant of the centrifugal instability (CFI) and show that our results are consistent with the predictions based on the study of magnetic CFI in rotating fluids. The results are discussed in the context of AGN jets in general and the nature of the Fanaroff-Riley morphological division of extragalactic radio sources in particular.
