A resolved jet-like radio-emitting structure on mas scales has been found in Cygnus X-1. The jet emission is relatively smooth, and does not show the knots and blobs seen in Cygnus X-3, SS433 and GRS1915+105. This suggests that the jet production mechanism in Cyg X-l is continuous, with the steady production of the energetic electrons and magnetic field required for the production of the radio emission. This is unlike the episodic jets seen in the other sources. The implications of these results for jet formation mechanisms will be discussed.
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