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   71182
   Recent observational studies of gravitational lensing clusters have
   revealed that the masses from lensing analyses are often more massive
   than that from X-ray analyses by factor of 2-3. However, it has been
   difficult to explain why this discrepancy arises, because of the lack
   of detailed information of the ICM state within the very center of
   distant lensing clusters due to the poor spatial resolution of X-ray
   spectroscopic observations. Here we propose ASCA observation of the
   nearest gravitational lensing cluster Abell 3408(z=0.04). Thanks to the
   low redshit of this cluster, we can observe the X-ray properties within
   the Einstein radius and can expect to resolve the lensing mass problem.
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