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We compare stellar mass surface density, metallicity, age, and line-of-sightvelocity dispersion profiles in massive ($M_*\geq10^{10.5}\,\mathrm{M_\odot}$)present-day early-type galaxies (ETGs) from the MaNGA survey with simulatedgalaxies from the TNG100 simulation of the IllustrisTNG suite. We find anexcellent agreement between the stellar mass surface density profiles of MaNGAand TNG100 ETGs, both in shape and normalisation. Moreover, TNG100 reproducesthe shapes of the profiles of stellar metallicity and age, as well as thenormalisation of velocity dispersion distributions of MaNGA ETGs. We generallyalso find good agreement when comparing the stellar profiles of central andsatellite galaxies between MaNGA and TNG100. An exception is the velocitydispersion profiles of very massive ($M_*\gtrsim10^{11.5}\,\mathrm{M_\odot}$)central galaxies, which, on average, are significantly higher in TNG100 than inMaNGA ($\approx50\,\mathrm{km\,s^{-1}}$). We study the radial profiles of$\mathit{in}$-$\mathit{situ}$ and $\mathit{ex}$-$\mathit{situ}$ stars in TNG100and discuss the extent to which each population contributes to the observedMaNGA profiles. Our analysis lends significant support to the idea thathigh-mass ($M_*\gtrsim10^{11}\,\mathrm{M_\odot}$) ETGs in the present-dayUniverse are the result of a merger-driven evolution marked by major mergersthat tend to homogenise the stellar populations of the progenitors in themerger remnant.

The Contribution of In-situ and Ex-situ Star Formation in Early-Type Galaxies: MaNGA versus IllustrisTNG