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Markarian (Mkn) 297 is a complex system with two interacting galaxies.Observations were made with ISO using ISOCAM, ISOPHOT and LWS. We presentISOCAM maps at 6.7, 7.7, 12 and 14.3 microns which, with PHT-S spectrometry ofthe central interacting region, probe the dust obscured star formation and dustproperties. ISOCAM reveals that the strongest emission region in the four MIRbands is completely unremarkable at visible and near-IR (e.g. 2MASS)wavelengths, and does not coincide with the nuclear region of either collidinggalaxy. It shares this striking characteristic with the overlap region of thecolliding galaxies in the Antennae (NGC 4038, 4039), the intragroup region ofStephan's Quintet, and IC 694 in the interacting system Arp 299. At 15 microns,the hidden source in Mkn 297 is, respectively, 14.6 and 3.8 times more luminousthan the hidden sources in the Antennae (NGC 4038/4039) and Stephan's Quintet.Numerical simulations indicate that we see the Mkn 297 interaction about 1.5 x10e8 years after the collision. ISOCAM shows knots and ridges of emission. The14.3/7.7 micron ratio map implies widespread strong star formation. Strongemission features were detected in the ISOPHOT spectrum, while [OI], [OIII] and[CII] emission lines were seen with LWS. Using data from the three instruments,luminosities and masses for two dust components were determined. The totalinfrared luminosity is approximately 10e11 L_sol, marginally a LIRG. A 1979supernova generated one of the most powerful known radio remnants (SN 1982aa)close to the strongest MIR source and identified with star forming region 14 inthe optical. This exceptional supernova explosion may have been accompanied bya GRB, and a search for a GRB in this direction in contemporaneous satellitedata is recommended.Comment: Accepted for publication in Astronomy and Astrophysics Updated to  better use recent SN/GRB work and tune terminology in Sec. 4.

ISO observations of the interacting galaxy Markarian 297