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Mergers between a massive galaxy and a small gas-rich companion (minormergers) have been proposed as a viable mechanism for triggering radio emissionin an active galaxy. Until now the problem has been catching this sequence ofevents as they occur. With MRC B1221$-$423 we have an active radio galaxy thathas only recently been triggered, and a companion galaxy that provides the"smoking gun". Using spectroscopic data taken with the VIMOS Integral FieldUnit detector on the European Southern Observatory's Very Large Telescope, wehave examined the distribution, ionization state and kinematics of ionized gasin this interacting system. We have also modelled the stellar continuum withsynthesised spectra of stellar populations of different ages. From our study ofthe ionized gas, we have derived preliminary models for the geometry of theinteraction, analysed the kinematic behaviour of the ionized gas, and examinedthe ionization mechanisms at work throughout the system. Our modelling of thestellar continuum allowed us to identify and date distinct stellar populationswithin the galaxy pair. We find evidence of multiple episodes of widespreadstarburst activity, and by dating these populations, we provide tentativeinsight into the history of the interaction.

Galactic interaction as the trigger for the young radio galaxy MRC B1221-423