...H. Imai^1,

Present address: Department of Physics, Kagoshima University, 1-12-35, Korimoto, Kagoshima 890-0065, Japan.

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...4,

Present address: Max-Plank-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany

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...5,

Worked in ASTRON/JIVE summer studentship 2003.

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... rotation

A possible effect of the annual parallax (<0.1 mas) is smaller than the proper motion uncertainty.

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... 1994

In Paper I, the dynamical age of the W43A jet was incorrectly calculated, the projected length of the jet divided by the 3D jet speed. Here, the dynamical age is recalculated, the projected length divided by the projected jet speed.

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