Stability of a relativistic rotating electron-positron jet: non-axisymmetric perturbations
Stability of a relativistic rotating electron-positron jet: non-axisymmetric perturbations
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相对论旋转电子-正电子射流的稳定性：非轴对称扰动
DOI：
10.1093/mnras/281.1.1
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
V. Pariev
中科院分区：
文献类型：
--
作者：
Y. Istomin;V. Pariev
本文在无力近似下研究了磁化等离子体流体动力学相对论流动的线性稳定性。我们考虑了冷而稠密的环境中的轻圆柱射流的情况，因此射流边界保持静止。连续和离散频谱的频率分析研究。在Alfv 'en连续体的边缘附近发现了一个无限的本征频率序列.数值计算表明，模式是稳定的，衰减增量$\gamma$很小。色散曲线$\omega =\omega（k_\parallel）$在$k_{{\parallel}_0}\simeq 1/R$（$R$为射流半径）处有一个最小值。这导致在射流内的扰动的积累与射流半径的量级的波长。以这种方式形成的扰动图案的波峰以超过光速的速度沿着射流移动。如果有相对论性电子在喷流内部发射同步辐射，那么这种图案就可以看到。这为我们提供了一种新型的超光速源。如果喷流的方向接近视线，那么观察者将看到结向后移动到核心。
We investigate the linear stability of a hydrodynamic relativistic flow of magnetized plasma in the force--free approximation. We considered the case of light cylindrical jet in cold and dense environment, so the jet boundary remains at rest. Continuous and discrete spectra of frequencies are investigated analytically. An infinite sequence of eigenfrequencies is found near the edge of Alfv\'en continuum. Numerical calculations showed that modes are stable and have attenuation increment $\gamma$ small. The dispersion curves $\omega =\omega (k_\parallel )$ have a minimum for $k_{{\parallel}_0}\simeq 1/R$ ($R$ is the jet radius ). This results in accumulation of perturbations inside the jet with wavelength of the order of the jet radius. The wave crests of the perturbation pattern formed in such a way move along the jet with the velocity exceeding light speed. If one has relativistic electrons emitting synchrotron radiation inside the jet, than this pattern will be visible. This provide us with the new type of superluminal source. If the jet is oriented close to the line of sight, than the observer will see knots moving backward to the core.