Abstract
InfraRed Imaging Surveyor (IRIS) is the first Japanese satellite project dedicated to infrared astronomy. IRIS has a 70 cm telescope cooled down to 7 K by using superfluid helium assisted by two-stage Stirling coolers. The expected hold time of the super-fluid helium is one year. Two focal plane instruments are planned; the InfraRed Camera (IRC) and the Far-Infrared Surveyor (FIS). The total spectral coverage is 2 to 200 microns. The major scientific objectives are to investigate birth and evolution of galaxies in the early universe by survey of young normal galaxies and starburst galaxies.
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