A Multiwavelength Study of the "Antennae" Scott Gordon (PhD student, Queensland University) Baerbel Koribalski (ATNF) Keith Jones (Queensland University) Presented here are radio continuum images of the interacting galaxy pair NGC 4038/39 (The "Antennae") taken during 1996 and 1997 with various configurations of the AT Compact Array. The 20-cm and 13-cm continuum data (see Fig. 1, top) was taken together with HI line data; the latter are not presented here. The 6-cm and 3-cm data (Fig. 1, bottom) was taken only over a few hours using 5 antennas on the 1.5D array. The 20-cm and 6-cm images are very similar to those presented by Hummel & van der Hulst (1986, A&A 155, 151) using the VLA. The 13-cm image strongly resembles the 6-cm image, whereas at 3-cm only the brightest emission peaks are clearly detected. The 3-cm radio continuum maxima coincide well with the overall structure of the CO emission measured with the OVRO Millimeter Wave Interferometer (Stanford et al. 1990, ApJ 349, 492), although the continuum to line ratio varies significantly. The galaxies NGC4038/39 were both originally independent disk galaxies, but are in the process of colliding to possibly form a single galaxy. This collision has gravitationally disrupted the disks, producing tails which are spectacular in optical images, and contain much of the system's neutral hydrogen. The collision has very likely stimulated star formation in the central disks, which is clearly visible in HST images revealing numerous young globular clusters within a number of giant HII regions (Whitmore & Schweizer 1995, AJ 109, 960). Several, but not all, of the HII regions correspond to maxima of the radio continuum emission shown here. The "Antennae" is well-known since it is rather nearby (systemic velocity approx. 1640 km/s) and shows classic features of interacting galaxies. The system was used as an example for computer simulations in the 1960s and 1970s by Toomre & Toomre (1972, ApJ 178, 623), which showed that features such as tidal tails can be produced by the gravitational disruption of two colliding galaxies.