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We combined new near-infrared VLT/HAWK-I data of the globular clusters (GCs)in the isolated edge-on S0 galaxy NGC 3115 with optical and spectroscopic onestaken from the literature, with the aim of analyzing the multiband GC colordistributions. A recent study from the SLUGGS survey has shown that the GCs inthis galaxy follow a bimodal distribution of Ca II triplet indices. Thus, NGC3115 presents a critical example of a GC system with multiple, distinct,metallicity subpopulations, and this may argue against the "projection"scenario, which posits that the ubiquitous color bimodality mainly results fromnonlinearities in the color-metallicity relations. Using optical, NIR, andspectroscopic data, we found strong and consistent evidence of indexbimodality, which independently confirms the metallicity bimodality in NGC 3115GCs. At the same time, we also found evidence for some color-colornonlinearity. Taken in the broader context of previous studies, the multicolorconsistency of the GC bimodality in NGC 3115 suggests that in cases where GCsystems exhibit clear differences between their optical and optical-NIR colordistributions (as in some giant ellipticals), the apparent inconsistencies mostlikely result from nonlinearities in the color-metallicity relations.

Globular clusters of NGC 3115 in the near-infrared. Demonstrating the correctness of two opposing scenarios