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   PR # 11111
    IRAS F10214+4724 is a ultra luminous infrared galaxy at the redshift
    of 2.286. After the discovery, many observations have been attained
    at UV, visible,near-infrared, and radio. These observations indicate
    two different emission mechanisms, one is star burst (primeval galaxy
    ?) and another is AGN activity. We propose ASCA observation to
    identify one of above two cases. In case of star burst, X ray flux
    must be below detection limit. On the other hand, significant X ray
    flux could be detected with 40K seconds integration, if AGN is energy
    source. In any case, the result of ASCA observation will be an essen-
    tial clue in studying the evolution of galaxies at high redshift.


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