民间社会组织的横向行动？
Transverse motions in CSOs?
摘要：
CSO的自行测量是确定河外新生射电源动力学演化的有力工具。我们在2004年和2006年用VLBA观测了3个CSO，以监测它们结构的变化并测量热点的分离速度。为了检验受抑天体的存在性，需要增加具有实测膨胀速度的CSO样本的规模，并对现有模型进行严格的约束。我们发现，所有三个对象观察到的热点的横向运动，我们建议作为更可能的解释，在射流轴的进动。这种行为可能会抑制或至少减缓射电源的增长，因为热点的头部不断击中ISM的新区域。因此，这些无线电源可能代表GPS/CSO的老群体。
英文摘要：
The measurement of proper motions in CSOs is a powerful tool to determine the dynamical evolution of the newly born extragalactic radio sources. We observed 3 CSOs with the VLBA in 2004 and in 2006 to monitor changes in their structure and measure the separation velocity of the hot spots. It is important to increase the size of the samples of CSOs with measured expansion velocity to test the existance of frustrated objects, and put stringent constraints on the current models. We found for all the three objects observed a transverse motion of the hotspots, and we suggest as the more likey explanation a precession in the jet axis. This behaviour likely inhibits or at least slows down the radio source growth because the head of the hotspot continuously hits new regions of the ISM. Therefore these radio sources may represent an old population of GPS/CSOs.
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