Global Distribution of Ionizing and Recombining Plasmas in the Supernova Remnant G290.1-0.8

الأصل · EN

We report on the Suzaku results of the mixed-morphology supernova remnant (SNR) G290.1-0.8 (MSH 11-61A). The SNR has an asymmetric structure extended to the southeast and the northwest. In the X-ray spectra of the center and the northwest regions, we discover recombining plasma features with the strong Si Lyα and radiative recombination continuum at 2.7 keV. These features are the most significant in the northwest region, and the spectra are well-reproduced with a recombining plasma of kT e = 0.5 keV. Whereas the spectra of other regions are expressed by an ionizing plasma of kT e = 0.6 keV. The recombining plasma has over-solar abundances, while the ionizing plasma has roughly solar abundances. Hence they are likely ejecta and interstellar medium (ISM) origin, respectively. The recombining plasma in the northwest of G290.1-0.8 would be generated by a break-out of the supernova ejecta from a high density circumstellar medium to a low density ISM.