IMAGING OF LUMINOUS INFRARED GALAXIES AT 3.4 MICRONS

We have imaged the central regions of eight luminous infrared galaxies at 3.4 mum. In most cases complementary images at J (1.25 mum), H (1. 65 mum), and K (2.2 mum) were obtained. The nuclei of all eight source s were detected at 3.4 mum. Several of the galaxies in our sample show significantly smaller image sizes at 3.4 mum than at K. We attribute these differences either to the presence of a compact infrared nucleus or to color differences among multiple nuclei. A very red compact inf rared source is detected at the location of the radio source C' in Arp 299.