tokens: We are grateful to the anonymous referee for offering constructive comments, which have contributed to substantially improving this paper. The VLBA and the VLA are operated by the National Radio Astronomy Observatory. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration (NASA). The study was partially supported by the Sasakawa Scientific Research Grant of The Japan Science Society (SN, 28-220) and by Grants-in-Aid for Scientific Research (B) (24340042, AD) of the Japan Society for the Promotion of Science (JSPS).
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