X-Ray Spectrum of a Peculiar Supernova Remnant, G 359.1-0.5
X-Ray Spectrum of a Peculiar Supernova Remnant, G 359.1-0.5
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DOI：
10.1093/pasj/63.3.527
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发表时间：
2011-03
影响因子：
2.3
通讯作者：
T. Ohnishi;K. Koyama;T. Tsuru;K. Masai;H. Yamaguchi;M. Ozawa
中科院分区：
文献类型：
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作者：
T. Ohnishi;K. Koyama;T. Tsuru;K. Masai;H. Yamaguchi;M. Ozawa
我们给出了超新星遗迹(信噪比)G 359.1�0.5在银河系中心区域方向的Suzaku结果。从SNR谱中，我们发现了高度电离的Si和S离子的显著K壳线，以及在2.5-3.0和3.1-3.6keV附近的异常结构。无论是处于电离平衡状态还是欠电离状态，都没有一个正则SNR等离子体模型能够解释这些结构。这些结构的能量和形状类似于自由电子到类氦硅和S离子K壳层的辐射跃迁(辐射复合连续体：RRC)。强RRC结构的存在表明等离子体处于过电离状态。事实上，观测到的光谱已经与过电离等离子体模型很好地拟合。最合适的电子温度为0.29keV，远低于电离温度0.77keV，这意味着G-359.1-�-0.5处于极端的过电离状态。我们报告了一些有关物理参数的注意事项，并对过电离等离子体的可能来源进行了评论。
We present Suzaku results of a supernova remnant (SNR), G 359.1� 0.5, in the direction of the Galactic center region. From the SNR, we have found prominent K-shell lines of highly ionized Si and S ions, together with unusual structures at 2.5–3.0 and 3.1–3.6 keV. No canonical SNR plasma model, in either ionization equilibrium or under-ionization, can explain the structures. The energies and shapes of the structures are similar to those of the radiative transitions of free electrons to the K-shell of He-like Si and S ions (radiative recombination continuum: RRC). The presence of strong RRC structures indicates that the plasma is in over-ionization. In fact, the observed spectrum has been well-fitted with an over-ionized plasma model. The best-fit electron temperature of 0.29 keV is far smaller than the ionization temperature of 0.77 keV, which means that G 359.1� 0.5 is in an extreme condition of over-ionization. We report some cautions on the physical parameters, and comment about possible origins for the over-ionized plasma.