CO APERTURE SYNTHESIS OF NGC-4038-39 (ARP-244)

High-resolution (6″) CO observations of the merging galaxies NGC 4038/39 (the "Antennae") have been made with the Owens Valley Millimeter Wave Interferometer. Three concentrations of CO emission were detected. In addition to masses of a few × 108 M⊙ at each nucleus, approximately 1.2 × 109 M⊙ of molecular gas was discovered in a 32″ × 22″ region where the two galaxies overlap. Within this region are four distinct clumps. These coincide with Ha, 10 μm, and radio continuum peaks, suggesting that they are extremely active sites of star formation. The galaxy interaction appears to have concentrated gas at the nuclei of NGC 4038 and NGC 4039 and to have engendered enhanced star formation activity in the region where their disks overlap. From estimates of the SFR in this overlap region, we suggest that the gas will be completely depleted in 2.4 × 108 yr.