We present the results of an X-ray spectral analysis of the northeast region of the candidate supernova remnant G189.6+3.3 with Suzaku. K-shell lines from highly ionized Ne, Mg, Si, and S were detected in the spectrum for the first time. In addition, a radiative recombining continuum (RRC) from He-like Si was clearly seen near 2.5 keV. This detection of an RRC reveals for the first time that G189.6+3.3 possesses an X-ray-emitting recombining plasma (RP). The extracted X-ray spectrum in the 0.6-10.0 keV energy band is well fitted with a model consisting of a collisional ionization equilibrium plasma component (associated with the interstellar medium) and an RP component (associated with the ejecta). The spectral feature shows that G189.6+3.3 is most likely to be a middle-aged SNR with an RP.

中文翻译：

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发现与候选超新星遗迹 G189.6+3.3 相关的等离子体与朱雀的重组

我们展示了朱雀对候选超新星遗迹 G189.6+3.3 东北地区的 X 射线光谱分析结果。首次在光谱中检测到来自高度电离的 Ne、Mg、Si 和 S 的 K 壳线。此外，在 2.5 keV 附近可以清楚地看到来自类 He 硅的辐射复合连续体 (RRC)。对 RRC 的检测首次揭示了 G189.6+3.3 具有发射 X 射线的复合等离子体 (RP)。在 0.6-10.0 keV 能带中提取的 X 射线光谱与由碰撞电离平衡等离子体分量（与星际介质相关）和 RP 分量（与喷射物相关）组成的模型非常吻合。光谱特征显示G189.6+3.3最有可能是中年信噪比RP。