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   61173
   "Dark Cluster" is a kind of objects which has few galaxies in it.
   Shortage of Galaxies sould lead to very low metal abundance in IGM
   plasma. Discovery of distant "dark cluster" AXJ2019+1127 with ASCA,
   however, arises a big mystery because it has extremely high metal
   abundance. Is there any object like this? A nearby diffuse X-ray object
   RXJ1833.6+6520 seems to have seldom galaxies in it. So we propose this
   object as a candidate for nearby "dark cluster" to be observed with
   ASCA. ASCA will be able to detect its metal abundance and other
   propoty, and will show us the nature of this object.
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