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The stellar initial mass function (IMF) regulates the baryonic cycle withingalaxies, and is a key ingredient to translate observations into physicalquantities. Although for decades it was assumed to be universal, there is nowgrowing observational evidence showing that the center of massive early-typegalaxies host an enhanced population of low-mass stars compared to theexpectations from the Milky Way. Moreover, these variations in the IMF havebeen found to be related to the radial metallicity variations in massivegalaxies. We present here a two-dimensional stellar population analysis of themassive lenticular galaxy FCC 167 (NGC 1380) as part of the Fornax3D project.Using a newly developed stellar population fitting scheme, we derive a fulltwo-dimensional IMF map of an early-type galaxy. This two-dimensional analysisallows us go further than a radial analysis, showing how the metallicitychanges along a disc-like structure while the IMF follows a distinct, lessdisky distribution. Thus, our findings indicate that metallicity cannot be thesole driver of the observed radial IMF variations. In addition, a comparisonwith the orbital decomposition shows suggestive evidence of a coupling betweenstellar population properties and the internal dynamical structure of FCC 167,where metallicity and IMF maps seem to track the distribution of cold and warmorbits, respectively.

The Fornax 3D project: a two-dimensional view of the stellar initial mass function in the massive lenticular galaxy FCC 167