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We investigate the spatially resolved stellar populations of a sample ofseven nearby massive Early-type galaxies (ETGs), using optical and nearinfrared data, including K-band spectroscopy. This data offers good prospectsfor mitigating the uncertainties inherent in stellar population modelling bymaking a wide variety of strong spectroscopic features available. We report newVLT-KMOS measurements of the average empirical radial gradients out to theeffective radius in the strengths of the Ca I 1.98$\mu$m and 2.26$\mu$mfeatures, the Na I 2.21$\mu$m line, and the CO 2.30$\mu$m bandhead. Followingprevious work, which has indicated an excess of dwarf stars in the cores ofmassive ETGs, we pay specific attention to radial variations in the stellarinitial mass function (IMF) as well as modelling the chemical abundancepatterns and stellar population ages in our sample. Using state-of-the-artstellar population models we infer an [Fe/H] gradient of -0.16$\pm$0.05 per dexin fractional radius and an average [Na/Fe] gradient of -0.35$\pm$0.09. We finda large but radially-constant enhancement to [Mg/Fe] of $\sim$ 0.4 and a muchlower [Ca/Fe] enhancement of $\sim$ 0.1. Finally, we find no significant IMFradial gradient in our sample on average and find that most galaxies in oursample are consistent with having a Milky Way-like IMF, or at most a modestlybottom heavy IMF (e.g. less dwarf enriched than a single power law IMF with theSalpeter slope).

Kinetys II: Constraints on spatial variations of the stellar initial mass function from K-band spectroscopy