X-Ray Observations of the Supernova Remnant W 28 with Suzaku. I. Spectral Study of the Recombining Plasma
X-Ray Observations of the Supernova Remnant W 28 with Suzaku. I. Spectral Study of the Recombining Plasma
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DOI：
10.1093/pasj/64.4.81
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发表时间：
2012-02
影响因子：
2.3
通讯作者：
M. Sawada;K. Koyama
中科院分区：
文献类型：
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作者：
M. Sawada;K. Koyama
我们提出了朱雀的混合形态超新星遗迹W28的结果。W28中心区的X射线谱显示出许多来自高度电离原子的明亮发射线。在Si莱曼$\alpha$能量和2.4- 5.0 keV下，光学薄的热等离子体在碰撞电离平衡下，无论是单温还是多温，都不能再现线状和凸状残留数据。这些凸起可能对应于类氦硅和硫的辐射复合连续谱。一个简单的重组等离子体模型很好地拟合了凸点结构，但未能拟合低能带。整体光谱可以与具有共同电子温度的多电离温度等离子体拟合。多电离温度被解释为电离和复合时标的元素差异。这些结果更倾向于稀疏方案的起源重组血浆。
We present the Suzaku results of the mixed-morphology supernova remnant W28. The X-ray spectra of the central region of W28 exhibit many bright emission lines from highly ionized atoms. An optically thin thermal plasma in collisional ionization equilibrium, either of single-temperature or multi-temperature failed to reproduce the data with line-like and bump-like residuals at the Si Lyman$\alpha$ energy and at 2.4--5.0 keV, respectively. The bumps probably correspond to radiative recombination continua from He-like Si and S. A simple recombining plasma model nicely fit the bump structures, but failed to fit low energy bands. The overall spectra can be fit with a multi-ionization temperature plasma with a common electron temperature. The multi-ionization temperatures are interpreted as elemental difference of ionization and recombination timescales. These results prefer the rarefaction scenario for the origin of the recombining plasma.