Probing the history of SS433's jet kinematics via Decade-resolution
  radio observations of W50
  We present the results of a kinematical study of the W50 nebula using high
resolution radio observations from the Very Large Array (VLA) spanning a
12-year period, sampled in 1984, 1993 and 1996. We conduct a careful analysis
of the proper motions of the radio filaments across the W50 nebula at each
epoch, and detect no significant motion for them during this period. The
apparent lack of movement in the radio filaments mandates either (i) a high
degree of deceleration of SS433's jet ejecta in the W50 nebula, or (ii) that
the lobes of W50 formed a long time ago in SS433's history, during a jet
outburst with appreciably different characteristics to the well-known
precessing jet state observed in SS433 at the present day. We discuss the
possible scenarios which could explain this result, with relevance to the
nature of SS433's current jet activity.
