Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2009-12-14
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
Slightly expanded version (6 pages) of a paper for the proceedings of the conference "X-Ray Astronomy 2009", eds A. Comastri e
Scientific paper
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 optical nebula coincides with a synchrotron-emitting radio cocoon, with a radio luminosity about 4 times that of Cas A. The central black hole appears as a hard X-ray source with a point-like, blue optical counterpart. Two prominent radio lobes are located at the extremities of the cocoon. Just ahead of the radio lobes, we found two X-ray hot spots, which we interpret as a signature of the 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 the system is powered by a jet. From the X-ray data, we estimate a jet power ~ a few times 10^{40} erg/s, active over a timescale ~10^{5} yrs. This extraordinary system is a long-sought analog of the Galactic microquasar SS 433.
Broderick John J.
Corbel Stephane
Motch Christian
Pakull Manfred
Soria Roberto
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