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We present a study of the three ultraluminous infrared galaxiesIRAS14348-1447, IRAS19254-7245, and IRAS23128-5919, based on mid-infrared (MIR)spectro-imaging (5-18microns) observations performed with ISOCAM. We find thatthe MIR emission from each system, which consists of a pair of interacting latetype galaxies, is principally confined to the nuclear regions with diameters of1-2kpc and can account for more than 95% of their IRAS 12micron flux. In eachinteracting system, the galaxy hosting an active galactic nucleus (AGN)dominates the total spectrum and shows stronger dust continuum (12-16microns)relative to the Unidentified Infrared Band (UIB) emission (6-9microns),suggestive of its enhanced radiation field. The MIR dominant galaxy alsoexhibits elevated 15micron/Halpha and 15micron/K ratios which trace the highextinction due to the large quantities of molecular gas and dust present in itscentral regions. Using only diagnostics based on our mid-infrared spectra, wecan establish that the Seyfert galaxy IRAS19254-7245 exhibits MIR spectralfeatures of an AGN while the MIR spectrum of the Seyfert (or LINER) member ofIRAS23128-5919 is characteristic of dust emission principally heated by starforming regions.Comment: Accepted for publication in Astronomy & Astrophysics, 13 pages, 9  figure

Mid-infrared observations of the ultraluminous galaxies IRAS 14348-1447, IRAS 19254-7245, and IRAS 23128-5919