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   PR #   119
   The Infrared Luminous Galaxies (IRL galaxies) are a new categoly
   ofgalaxies with the high far-infrared luminosity more than 10E45
   ergssE-1. Many authors suggested that the high infrared luminosity
   isproduced by the dust irradiation by young AGN stimulated by the
   closedinteraction of galaxies. The others of authors, however,
   arguedagainst for it, and suggested that the star burst stimulated by
   thegalaxy interaction causes the enormous far-infrared dust
   emission.The hard X-ray detection is thought to be good test of
   existence ofAGN activity. Additionally, the measurements of the low
   energythermal emission will help the studies of the star burst
   activity inthe dusty cloud. We would investigate them by the
   observation of oneof the brightest IRL galaxies, Arp 220.
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