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   PR # 11085
    We propose to conduct a systematic survey of bright normal spiral
    galaxies.  We chose thirteen galaxies whose total X-ray flux is expec
    ted to be bright enough that ASCA can study the nature of X-ray emis-
    sions from spatial and spectral points of view, but have not been
    studied very well with previous missions. The proposed observations
    can identify the major contributor of the X-ray emissions of the
    galaxy,i.e. whether it is a sum of low-mass binaries,a low-luminosity
    active galactic nuclei like M33, or a star burst activity.The system-
    atic study of the present proposal together withthe PV observations
    will gives us a unified understanding of X-raypopulation of normal
    spiral galaxies and impose a strong constraint on the origin of low-
   mass X-ray binaries.
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