0836+710喷流横向结构揭示的物理性质
Physical properties of the jet in 0836+710 revealed by its transversal structure
摘要：
研究河外喷流的内部结构对于理解其物理性质至关重要。由日本牵头的空间VLBI项目VSOP为这类研究提供了机会，该项目的基线长度可达36，000公里，并在5千兆赫下分辨角尺寸小至$\approx 0.3$ mas的结构。VSOP观测的射流在0836+710在1.6和5 GHz的径向结构的流的跟踪尺度从2质量到200质量沿射流和确定的波长的个别振荡模式负责形成观察到的结构。我们应用线性稳定性分析，以确定与所观察到的结构的波长相匹配的Kelvin-Helmholtz不稳定模式的振荡模式。我们发现0836+710中的喷流结构可以用Kelvin-Helmholtz不稳定性的螺旋面模和螺旋体模与椭圆体模的组合来再现。我们的研究结果表明，射流基本上是分层的，不同的模式的不稳定性增长的射流内在不同的距离射流轴。螺旋表面模可以被外部驱动，我们讨论了驱动频率对0836+710活动核物理的影响。
英文摘要：
Studying the internal structure of extragalactic jets is crucial for understanding their physics. The Japanese-led space VLBI project VSOP has presented an opportunity for such studies, by reaching baseline lengths of up to 36,000 km and resolving structures down to an angular size of $\approx 0.3$ mas at 5 GHz. VSOP observations of the jet in 0836+710 at 1.6 and 5 GHz have enabled tracing of the radial structure of the flow on scales from 2 mas to 200 mas along the jet and determination of the wavelengths of individual oscillatory modes responsible for the formation of the structure observed. We apply linear stability analysis to identify the oscillatory modes with modes of Kelvin-Helmholtz instability that match the wavelengths of the structures observed. We find that the jet structure in 0836+710 can be reproduced by the helical surface mode and a combination of the helical and elliptic body modes of Kelvin-Helmholtz instability. Our results indicate that the jet is substantially stratified and different modes of the instability grow inside the jet at different distances to the jet axis. The helical surface mode can be driven externally, and we discuss the implications of the driving frequency on the physics of the active nucleus in 0836+710.
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