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We present Gemini/GNIRS cross-dispersed near-infrared spectra of 12 nearbyearly-type galaxies, with the aim of testing commonly used stellar populationsynthesis models. We select a subset of galaxies from the atlas/ sample whichspan a wide range of ages (SSP-equivalent ages of 1--15~Gyr) at approximatelysolar metallicity. We derive star formation histories using four differentstellar population synthesis models, namely those of [bruzual_stellar_2003],Conroy, Gunn \& White (2009; 2010), [maraston_stellar_2011] and[vazdekis_uv-extended_2016]. We compare star formation histories derived fromnear-infrared spectra with those derived from optical spectra using the samemodels. We find that while all models agree in the optical, the derived starformation histories vary dramatically from model to model in the near-infrared.We find that this variation is largely driven by the choice of stellar spectrallibrary, such that models including high quality spectral libraries provide thebest fits to the data, and are the most self-consistent when comparingoptically-derived properties with near-infrared ones. We also find the impactof age variation in the near-infrared to be subtle, and largely encoded in theshape of the continuum, meaning that the common approach of removing continuuminformation with a high-order polynomial greatly reduces our ability toconstrain ages in the near-infrared.

Comparison of Stellar Population Model Predictions Using Optical and Infrared Spectroscopy