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We study the ionization and kinematics of the ionized gas in the nuclearregion of the barred Seyfert 2 galaxy NGC~5643 using MUSE integral fieldobservations in the framework of the MAGNUM (Measuring Active Galactic NucleiUnder MUSE Microscope) survey. The data were used to identify regions withdifferent ionization conditions and to map the gas density and the dustextinction. We find evidence for a double sided ionization cone, possiblycollimated by a dusty structure surrounding the nucleus. At the center of theionization cone, outflowing ionized gas is revealed as a blueshifted,asymmetric wing of the [OIII] emission line, up to projected velocityv(10)~-450 km/s. The outflow is also seen as a diffuse, low luminosity radioand X-ray jet, with similar extension. The outflowing material points in thedirection of two clumps characterized by prominent line emission with spectratypical of HII regions, located at the edge of the dust lane of the bar. Wepropose that the star formation in the clumps is due to `positive feedback'induced by gas compression by the nuclear outflow, providing the firstcandidate for outflow induced star formation in a Seyfert-like radio quiet AGN.This suggests that positive feedback may be a relevant mechanism in shaping theblack hole-host galaxy coevolution.

The MAGNUM survey: Positive feedback in the nuclear region of NGC 5643 suggested by MUSE