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Stellar population synthesis (SPS) models are a key ingredient of many galaxyevolution studies. Unfortunately, the models are still poorly calibrated forcertain stellar evolution stages. Of particular concern is the treatment of thethermally-pulsing asymptotic giant branch (TP-AGB) phase, as differentimplementations lead to systematic differences in derived galaxy properties.Post-starburst galaxies are a promising calibration sample, as TP-AGB stars arethought to be most prominently visible during this phase. Here, we usepost-starburst galaxies in the NEWFIRM medium-band survey to assess differentSPS models. The available photometry allows the selection of a homogeneous andwell-defined sample of 62 post-starburst galaxies at 0.7<z<2.0, from which weconstruct a well-sampled composite spectral energy distribution (SED) over therange 1200-40 000 Angstrom. The SED is well-fit by the Bruzual & Charlot SPSmodels, while the Maraston models do not reproduce the rest-frame optical andnear-infrared parts of the SED simultaneously. When the fitting is restrictedto lambda < 6000 Angstrom, the Maraston models overpredict the near-infraredluminosity, implying that these models give too much weight to TP-AGB stars.Using the flexible SPS models by Conroy et al, and assuming solar metallicity,we find that the contribution of TP-AGB stars to the integrated SED is a factorof ~3 lower than predicted by the latest Padova TP-AGB models. Whether this isdue to lower bolometric luminosities, shorter lifetimes, and/or heavy dustobscuration of TP-AGB stars remains to be addressed. Altogether, our datademand a low contribution from TP-AGB stars to the SED of post-starburstgalaxies.

The Spectral Energy Distribution of Post-Starburst Galaxies in the NEWFIRM Medium-Band Survey: A Low Contribution from TP-AGB Stars