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   51232
   The origin of hot gas and Fe in the cluster of galaxies in one of the
   most fundamental problem in X ray astronomy. Arnaud et al. (1992) fund
   good correlation between total luminosity of early type galaxies and
   gas mass or iron mass. This correlation strongly suggest the galactic
   wind origin of ICM. Our goal in this proposal is test this model more
   qualitatively. We are going to observe minimum cluster in which there
   is only on galaxy. And this galaxy have to a passively evolved early
   type. In such ideal object, we can accurately estimate total mass of
   gas and iron which has been ejected steady Type Ia SN and stellar mass
   loss and compare to observed result. NGC4756 is the best object to
   satisfy these condition.
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