The l6~(th) magnitude quasar 3C 345 (redshift z=0.5928) shows structural and emission variability on parsec scales around a compact unresolved radio core. For the last three decades it has been closely monitored with very long baseline interferometry (VLBI), yielding a wealth of information about the physics of relativistic outflows and dynamics of the central regions in AGN. We present here preliminary results for the long-term jet evolution, based on the 15 GHz monitoring data collected by the MOJAVE survey and various other groups over the last ～14 years and combined with data from earlier VLBI observations of 3C 345 which started in 1979. We discuss the trajectories, kinematics, and flux density evolution of enhanced emission regions embedded in the jet and present evidence for geometrical (e.g. precession) and physical (e.g. relativistic shocks and plasma instability) factors determining the morphology and dynamics of relativistic flows on parsec scales.
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机译：L6〜（Th）幅度3C 345（Redshift Z = 0.5928）在Compact Rootved无线电核心周围的Parsec尺度上示出了结构和排放可变性。在过去的三十年里，它受到了非常长的基线干涉测量（VLBI）密切监测，产生了有关AGN中央地区的相对论流出和动态的物理学的大量信息。我们在这里展示了长期喷射演进的初步结果，基于Mojave调查和过去14年中的各种其他群体收集的15 GHz监测数据，并将来自早期VLBI的数据与1979年开始的3C 345的数据相结合。我们讨论嵌入式射流中的增强排放区域的轨迹，运动学和助焊剂密度演化，并提出了几何（例如进程）和物理（例如相对论的冲击和等离子体不稳定）因素确定Parsec上相对论流动的形态和动态的因素秤。
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