The following document lists the file abstract/TONAKA_GALIR.abs
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===================================================================== ==> In this proposal, more time is being requested for TONAKA.IRGAL_1 ==> This proposal requests an upgrade from Priority 3 for TONAKA.IRGAL_1 ===================================================================== The origin of the IR emission from normal galaxies and its relation to the properties of galaxies is poorly understood. There are known to be a systematic variation in the MIR to FIR emission from galaxies and the IR emission of galaxies is thought to consist of several components. However, a clear identification and origin of each component still remain open problems. These properties and components can be studied in the framework of an analogue to the diffuse IR emission in our Galaxy. In the first call proposal, TONAKA.IRGAL_1, we have proposed ISO observations to complement the IRTS/MIRS observations and study the IR properties of external galaxies. The observations made by the Mid-IR spectrometer (MIRS) on board the Infrared Telescope in Space (IRTS) detected the Unidentified IR (UIR) bands in the diffuse galactic emission. They have also indicated that most MIR emission in the diffuse medium comes from the UIR bands. The FIR spectroscopy of external galaxies together with the MIR imaging by ISO can thus elucidate the origin of the IR emission from external galaxies, complemented by the detailed study of the diffuse emission in our Galaxy by IRTS/MIRS. In this proposal, we request to upgrade the grade 3 observations of IRGAL_1 and to add three galaxies to cover a sufficient range of the IR properties of galaxies. The results will lead to a better understanding of the IR properties of external galaxies with the complementary study by the IRTS/MIRS.