论文标题
观察到的极化方向取决于相对论喷气的几何和运动学参数
The observed polarization direction depending on geometrical and kinematic parameters of relativistic jets
论文作者
论文摘要
极化方向的研究对于恢复活性星系parsec尺度喷气机中磁场的空间结构的问题至关重要。但是，由于相对论效应，不能假定投影到源参考框架中天体球的磁场不能假定与波浪中电向矢量的观察方向是正交的。此外，射流组件的局部轴可能与其运动方向不一致，这会影响观察到的极化方向。在本文中，我们分析了波浪中电向矢量的横向，这是由于用不同的射流运动学和几何参数建模的，用于螺旋磁场，具有不同的扭曲角度和中心的圆环磁场，并被不同的厚度鞘包围，并被多动球场穿透。我们获得了：1）电矢量横向分布的形状以复杂的方式取决于射流轴的角度，而视线与速度向量； 2）仅在波浪中使用电矢量的分布来确定螺旋磁场的扭曲方向的歧义； 3）两者都考虑的磁场拓扑都可以重现``脊柱衬衫''极化结构和单个亮细节，并具有纵向轴极化方向的纵向。
The study of the polarization direction is crucial in the issue of restoring the spatial structure of the magnetic field in the active galaxy parsec-scale jets. But, due to relativistic effects, the magnetic field projected onto the celestial sphere in the source reference frame cannot be assumed to be orthogonal to the observed direction of the electric vector in the wave. Moreover, the local axis of the jet component may not coincide with its motion direction, which affects the observed polarization direction. In this article, we analyze the transverse to jet distributions of the electric vector in the wave, obtained as a result of modeling with different jet kinematic and geometrical parameters for a helical magnetic field with a different twist angle and for a toroidal magnetic field in the center, surrounded by a varying thickness sheath, penetrated by a poloidal field. We obtained: 1) the shape of the electric vector transverse distribution depends in a complex way on the angles of the jet axis and the velocity vector with the line of sight; 2) ambiguity in determining the twist direction of the helical magnetic field under using only the distributions of the electric vector in the wave; 3) both considered magnetic field topologies can reproduce both the ``spine-sheath'' polarization structure and individual bright details with the longitudinal to the jet axis polarization direction.
