文章基本信息

标题：The History of the Equatorial Emission in SS433
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作者：R.E. Spencer
期刊名称：PoS - Proceedings of Science
印刷版ISSN：1824-8039
出版年度：2006
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.