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   PR # 41279
   The cluster of galaxies Cl0024+17 is a unique object at a redshift of
   0.39 since there is a certain evidence of the existence of the
   backgroud cluster of galaxies at a redshift of higher than 1 which is
   significantly magnified by lensing effect of Cl0024+17. Our
   simulation shows that the gravitational magnification due to
   Cl0024+17 makes the redshifted iron-line from the background cluster
   observable, which is otherwise hard to detect. We propose the first
   attack to search for X-ray emission from very distant cluster of
   galaxies using a foreground rich cluster of galaxies as a
   gravitational telescope.
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