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We present high-resolution (R ~ 24,600) near-IR spectroscopy of the youngestsuper star clusters (SSCs) in the prototypical starburst merger, the AntennaeGalaxies. These SSCs are young (3-7 Myr old) and massive (10^5 - 10^7 M_sun fora Kroupa IMF) and their spectra are characterized by broad, extended Br-gammaemission, so we refer to them as emission-line clusters (ELCs) to distinguishthem from older SSCs. The Brgamma lines of most ELCs have supersonic widths(60-110 km/s FWHM) and non-Gaussian wings whose velocities exceed the clusters'escape velocities. This high-velocity unbound gas is flowing out in winds thatare powered by the clusters' massive O and W-R stars over the course of atleast several crossing times. The large sizes of some ELCs relative to those ofolder SSCs may be due to expansion caused by these outflows; many of the ELCsmay not survive as bound stellar systems, but rather dissipate rapidly into thefield population. The observed tendency of older ELCs to be more compact thanyoung ones is consistent with the preferential survival of the mostconcentrated clusters at a given age.

Feedback in the Antennae Galaxies (NGC 4038/9): I. High-Resolution Infrared Spectroscopy of Winds from Super Star Clusters