出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：The equatorial radio emission recently discovered in SS433 adds a further intriguing feature to
what is already a bizarre object. Radio images of SS433 taken over the last 25 years were
examined to find that evidence for the existence of the emission exists even in the early images.
The extended emission is found in 18 out of 78 separate observations, with a higher detection
rate in recent years, reflecting improving imaging capability of interferometer arrays. The
position angle of the emission changes, being on average perpendicular to the precession axis of
the jets and varying over a similar range to that of the jets, however there is not a close
relationship between the jet and equatorial emission position angle. This suggests that if the
emission is formed by a precessing equatorial wind then the wind velocity must vary.
Alternatively the emission could be due to colliding back flow from the jets.
