SS433: outflows here and there

2); (2) FOMI SGO; (3) Astron; 4); (4) Leiden Obs.; (5) Jodrell Bank Obs.; (6) Univ. Central Lancashire); A.M. Stirling (6) ((1) JIVE; I. Fejes (2); R.C. Vermeulen (3)

SS433: outflows here and there

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arxiv astro-ph/0208125 v1 pith:ZAS6MX35 submitted 2002-08-06 astro-ph

Z. Paragi (1 , 2) , I. Fejes (2) , R.C. Vermeulen (3) , R.T. Schilizzi (1 , 4) , R.E. Spencer (5) , A.M. Stirling (6) ((1) JIVE

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(2) FOMI SGO (3) Astron (4) Leiden Obs. (5) Jodrell Bank Obs. (6) Univ. Central Lancashire)

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We summarize the results of VLBA and global VLBI observations of SS433 between 1995 and 2000. With these observations we resolve the inner jet of the source and identify an absorption region (~25 AU), the "central radio gap". The radio gap is caused by free-free absorption of the jet radio emission by a flattened outflow from the binary system. Radio emission is detected on 100 AU scales perpendicular to the normal jets ("equatorial emission region"; "equatorial outflow"). At some epochs the emission is smooth but compact features are frequently detected. We suggest that equatorial outflows may be common in microquasars.

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The First Measurement of Jet Collimation Profiles in an X-ray Binary: the Case of SS 433
astro-ph.HE 2026-07 conditional novelty 7.0 of 10

SS 433’s approaching jet shows a quasi-parabolic collimation profile and progressive opening-angle decrease, the first such measurement in an X-ray binary, plus a core-shift index near −1.

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