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Abstract: The measurement of proper motions in CSOs is a powerful tool to determine thedynamical evolution of the newly born extragalactic radio sources. We observed3 CSOs with the VLBA in 2004 and in 2006 to monitor changes in their structureand measure the separation velocity of the hot spots. It is important toincrease the size of the samples of CSOs with measured expansion velocity totest the existance of frustrated objects, and put stringent constraints on thecurrent models. We found for all the three objects observed a transverse motionof the hotspots, and we suggest as the more likey explanation a precession inthe jet axis. This behaviour likely inhibits or at least slows down the radiosource growth because the head of the hotspot continuously hits new regions ofthe ISM. Therefore these radio sources may represent an old population ofGPS-CSOs.

Autor: Carlo Stanghellini, Daniele Dallacasa, Tiziana Venturi, An Tao, Hong Xiao-Yu


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