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We have studied the newly-discovered microquasar in NGC 7793 in radio,optical and X-ray bands. This system comprises a large (250 x 120 pc)line-emitting optical nebula, detected in H-alpha and HeII 4686. The opticalnebula coincides with a synchrotron-emitting radio cocoon, with a radioluminosity about 4 times that of Cas A. The central black hole appears as ahard X-ray source with a point-like, blue optical counterpart. Two prominentradio lobes are located at the extremities of the cocoon. Just ahead of theradio lobes, we found two X-ray hot spots, which we interpret as a signature ofthe bow shock into the interstellar medium. The X-ray hot spots, radio lobes,X-ray core and major axis of the cocoon are well aligned, proving that thesystem is powered by a jet. From the X-ray data, we estimate a jet power ~ afew times 10^{40} erg/s, active over a timescale ~10^{5} yrs. Thisextraordinary system is a long-sought analog of the Galactic microquasar SS433.

Radio lobes and X-ray hot spots of the extraordinary microquasar in NGC 7793