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   61060
   The Galactic Center region is a treasury of X-ray stars. We here focus
   the unidentified hard X-ray sources --- probably a black-hole candidate
   (BHC). A few BHCs in the Galactic Center region is eccentric and out of
   the general scheme of BHCs. There exists possibly an another category
   of BHCs. We try to make clear the hypothesis by investigating some
   unidentified BHCs. On the other hand, measuring X-ray absorption is the
   good method to study the mass from the source to us. We have made an
   effort to study the mass distribution of our Galaxy by this method with
   ASCA data, and succeeded to an extent, though the sample is rather
   less. In this work, we expect to increase the number of samples, and
   will be able to estimate the mass distribution much exactly.
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