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|  Name :  |   Hajime Inoue  |  
|  Institute :  |   Institute of Space and Astronautical Science  |  
|  E-mail :  |   inoue@astro.isas.ac.jp  |  
|  TITLE :  |   X-ray observations of particle accelerators in the Universe  |  
|  ABSTRACT :  |  |  
 |   Particle accelerators with various sizes in the Universe are surveyed.  I 
  show some topics on SNR's, the Galactic ridge emission, jets from AGN's and 
  black-hole candidates, and clusters of galaxies, mainly based on recent 
  X-ray observations. At the same time, I discuss what is the key issue in 
  each of the topics to be resolved in future observations. 
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