"X-ray
observation of middle-aged SNRs
Prof. Hiroshi Tsunemi (Graduate School of Science, Earth and Space Science Osaka University)
Abstract:
We have studied the Cygnus Loop, a typical middle-aged SNR, in X-ray using the Asca and Rosat satellites. The middle-aged SNR showing thermal emission is a good place to study the evolution of the interstellar matter. The shell region, high density region, shows a abundance of the ISM while the inner region, low density region, shows a metal rich abundance originating from the ejecta. Other middle-aged SNRs showing center-filled structure may reflect the thermal energy contained inside the SNR. We have estimated the total energy of the SN. Some other SNRs may be mentioned.