Abstract
ROSAT has detected X-ray emission from more than 100 galactic supernova remnants with more than 100 SNR candidates, out of which a dozen sources have been confirmed by radio and optical measurements. Highlights of more than 7 years of ROSAT observations of SNRs include the discovery of progenitor fragments in the Vela SNR, the discovery of colliding SNR shells, high resolution images of shocked clouds in the Cygnus Loop, the studies of spatial and thermal structure, which favour an ambient medium of evaporating clouds. ASCA has added to this by high quality energy spectra including Doppler velocity maps of Cas-A in various emission lines, ionization non-equilibrium in the Cygnus Loop, the detection of non-thermal X-rays from sections of the SN 1006 shell and RX J1713.7-3946, an SNR discovered by ROSAT. These observations have broadened our understanding of SN explosions, the propagation of shock waves and the properties of the ambient medium as well as the acceleration of cosmic rays in SNR shells.
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