论文标题
QSO 3C345中超亮成分的多普勒增强效果和通量演变
Doppler boosting effect and flux evolution of superluminal components in QSO 3C345
论文作者
论文摘要
先前提出的进攻式射击场景被应用于解释五个六级成分（C4，C5，C9，C10和C22）的VLBI测量运动学及其在Blazar 3C345中的磁通密度演变。 It is shown that in the inner-trajectory sections their kinematic properties, including trajectory,coordinates, core separation and apparent velocity can be well model-simulated by using the scenario with a precession period of 7.30yr (4.58yr in the source frame) and a precessing common trajectory, which produces the individual knot-trajectories at their corresponding precession phases.通过其大量洛伦兹因子的运动学行为的模型模拟，视角和多普勒因子是时间的功能。这些预期确定的洛伦兹/多普勒因子用于研究结的多普勒增强效果并解释其通量演化。发现在15、22和43GHz时观察到的五个高闪光成分的光曲与与多普勒的增强轮廓非常吻合。此外，较短的时间尺度上的某些通量波动可能是由于结的内在通量和光谱指数的变化所致。 The close relation between the flux evolution and the Doppler boosting effect not only firmly validates the precessing jet-nozzle scenario being fully appropriate to explain the kinematic and emission properties of superluminal components in QSO 3C345, but also strongly supports the traditioal common point-view: superluminal components are physical entities (shocks or plasmoids) participating relativistic motion toward us with沿螺旋轨迹的加速/减速。
The precessing jet-nozzle scenario previously proposed was applied to interpret the VLBI-measured kinematics of five superluminal components (C4,C5,C9,C10 and C22) and their flux density evolution in blazar 3C345. It is shown that in the inner-trajectory sections their kinematic properties, including trajectory,coordinates, core separation and apparent velocity can be well model-simulated by using the scenario with a precession period of 7.30yr (4.58yr in the source frame) and a precessing common trajectory, which produces the individual knot-trajectories at their corresponding precession phases. Through the model-simulation of their kinematic behavior their bulk Lorentz factor ,viewing angle and Doppler factor were derived as functions of time. These anticipatively-determined Lorentz/Doppler factors were used to investigate the knots' Doppler-boosting effect and interpret their flux evolution. It was found that the light-curves of the five superluminal components observed at 15, 22 and 43GHz were extraordinarily well coincident with their Doppler boosting profiles. Additionally, some flux fluctuations on shorter time-scales could be due to variations in knots' intrinsic flux and spectral index. The close relation between the flux evolution and the Doppler boosting effect not only firmly validates the precessing jet-nozzle scenario being fully appropriate to explain the kinematic and emission properties of superluminal components in QSO 3C345, but also strongly supports the traditioal common point-view: superluminal components are physical entities (shocks or plasmoids) participating relativistic motion toward us with acceleration/deceleration along helical trajectories.
