Models of Extragalactic Jets

银河系外射电喷流的模型将使用各种数值方法来构建。一个本质上是三维边界跟踪代码将用于继续研究射电喷流的形成和演化。特别地，当中心星系源通过外部介质时，由冲压压力引起的射流弯曲，非轴对称不稳定性的增长，以及射流流体的加工源的影响，都将被研究。最近开发的射流从星系晕传播的分析模型将进一步发展，穿过压力匹配的界面进入极热的星系际介质。利用这一想法进行的初步计算似乎可以很好地解释目前强射电源的平均大小，以及这些源在早期宇宙时代明显更小的事实。将使用三维边界跟踪代码和完整的二维流体力学代码开发这种情况的数值模型，并将与统计数据进行更详细的比较。射流不稳定性的分析模型将应用于一个特别有趣的射电源的甚大阵列（VLA）射电图，该射电源具有单个振荡射流馈送到漫射瓣。基于相干等离子体过程的活动星系核连续电磁发射的一般模型将进一步发展并与观测结果进行比较。

Models of extragalactic radio jets will be constructed using a variety of numerical approaches. An essentially three-dimensional boundary-following code will be used to continue to investigate the formation and evolution of radio jets. In particular, the bending of jets by ram pressure as the central galactic source moves through an external medium, the growth of non-axisymmetric instabilities, and the effects of a precessing source of jet fluid, will all be studied. Recently developed analytic models of jet propagation from a galactic halo across a pressure-matched interface into an extremely hot intergalactic medium will be developed further. Preliminary calculations using this idea seem to provide good explanations for both the current average size of strong radio sources and the fact the such sources were significantly samller at earlier cosmological epochs. Numerical models of this situation will be developed using both the three-dimensional boundary following code and a full two-dimensional hydrodynamics code and more detailed comparisons with statistical data will be made. Analytic models for jet instabilities will be applied to Very Large Array (VLA) radio maps of a particularly interesting radio source with a single, oscillatory jet feeding into a diffuse lobe. A general model for the continuum electromagnetic emission from active galactic nuclei, based on coherent plasma processes, will be further developed and compared with observations.