Blazar S5 0716+71螺旋喷流模型中喷流的几何和运动学参数
Geometrical and Kinematic Parameters of the Jet of the Blazar S5 0716+71 in a Helical-Jet Model
摘要：
Blazar S5 0716+71内部喷流位置角的周期性变化表明喷流具有螺旋结构。确定了螺旋射流模型的几何参数。它示出，当射流组件的轨迹是非弹道的，它们的速度矢量和视线之间的角度位于一个更宽的间隔比的情况下的组件的弹道运动，在协议与现有的估计。在2004年和2008-2010年两个时期内喷流和外喷流中各组分的表观速度的矛盾结果可以用这样一个模型来解释。内喷流和外喷流中的视速度比用于推导部件真实速度的下限（$β>0.999$）并确定螺旋喷流的螺距角（$p=5.5^\circ$）。导出的参数可以产生观察单个射流部件的高速度（高达37 $c$）所需的条件。
英文摘要：
Periodic variations of the position angle of the inner jet of the blazar S5 0716+71 suggest a helical structure for the jet. The geometrical parameters of a model helical jet are determined. It is shown that, when the trajectories of the jet components are non-ballistic, the angle between their velocity vectors and the line of sight lies in a broader interval than is the case for ballistic motions of the components, in agreement with available estimates. The contradictory results for the apparent speeds of components in the inner and outer jet at epochs 2004 and 2008-2010 can be explained in such a model. The ratio of the apparent speeds in the inner and outer jet is used to derive a lower limit for the true speed of the components ($β>0.999$) and to determine the pitch angle of the helical jet ($p=5.5^\circ$). The derived parameters can give rise to the conditions required to observe high speeds (right to 37$c$) for individual jet components.
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