Search for synchrotron x-ray SNRs as birthplaces of cosmic rays

SNRs emitting synchrotron Xrays (SXSNR) accelerate cosmic rays up to a fewhundreds TeV, though the number of them are still smaller to account forall the number of high energy cosmic rays in our Galaxy. Next subject would beto know how many SXSNRs are still unknown behind large absorption in previousobservations, and to estimate the rate of cosmic rays in SNRs quantitatively.We selected SXSNR candidates from ASCA Galactic ridge survey and began to judgewhether they are truly SXSNR or not with ASCA, Chandra, and Newton. Ourobservations will complete our SXSNR search and reveal us the critical cluesabout the subjects of cosmic ray acceleration. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]