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Integral field spectroscopy in the K-band (1.9-2.4um) was performed on fourIR-bright star clusters and the two nuclei in NGC 4038/4039 (``The Antennae'').Two of the clusters are located in the overlap region of the two galaxies, andtogether comprise ~25% of the total 15um and ~10% of the total 4.8 GHz emissionfrom this pair of merging galaxies. The other two clusters, each of themspatially resolved into two components, are located in the northern galaxy, onein the western and one in the eastern loop of blue clusters. Comparing ouranalysis of Brgamma, CO band-heads, He I (2.058um), Halpha (from archival HSTdata), and V-K colors with stellar population synthesis models indicates thatthe clusters are extincted (A_V ~ 0.7 - 4.3 mags) and young, displaying asignificant age spread (4-13 Myrs). The starbursts in the nuclei are much older(65 Myrs), with the nucleus of NGC 4038 displaying a region of recent starformation northward of its K-band peak. Using our derived age estimates andassuming the parameters of the IMF (Salpeter slope, upper mass cut-off of 100M_sun, Miller-Scalo between 1 M_sun and 0.1 M_sun), we find that the clustershave masses between 0.5 and 5 * 10^6M_sun.Comment: 10 pages, 3 figures, ApJ accepte

K‐Band Spectroscopy of Compact Star Clusters in NGC 4038/4039