论文标题
使用反射光谱仪的深XMM-Newton观测值的超新星残留N132D的等离子体诊断
Plasma Diagnostics of the Supernova Remnant N132D Using Deep XMM-Newton Observations with the Reflection Grating Spectrometer
论文作者
论文摘要
我们使用反射光谱仪（RGS）在大麦芽云（LMC）中介绍了N132D的XMM-Newton观察结果，即X射线最亮的超新星残留物（SNR），可在软X射线带中启用高分辨率光谱仪。在集成了〜200 ks的轴上观测值的RGS数据中，新检测到了中间电荷状态下各个元素的L壳转变的十二条发射线。 0.3-2.0-keV光谱至少需要具有不同电子温度的热等离子体的三个成分，并表明明确的非平衡电离电离（NEI）证据。我们详细的频谱诊断进一步表明，O VII和NE IX的禁用线比均高于典型的NEI等离子体的预期。这种增强还可以归因于电荷交换引起的共振散射或发射，除了可能由多个温度成分的叠加产生贡献，尽管缺乏空间信息使我们无法得出结论，这很可能是很可能。
We present XMM-Newton observations of N132D, the X-ray brightest supernova remnant (SNR) in the Large Magellanic Cloud (LMC), using the Reflection Grating Spectrometer (RGS) that enables high-resolution spectroscopy in the soft X-ray band. A dozen emission lines from L-shell transitions of various elements at intermediate charge states are newly detected in the RGS data integrating the ~200-ks on-axis observations. The 0.3-2.0-keV spectra require at least three components of thermal plasmas with different electron temperatures and indicate clear evidence of non-equilibrium ionization (NEI). Our detailed spectral diagnostics further reveal that the forbidden-to-resonance line ratios of O VII and Ne IX are both higher than expected for typical NEI plasmas. This enhancement could be attributed to either resonance scattering or emission induced by charge exchange in addition to a possible contribution from the superposition of multiple temperature components, although the lack of spatial information prevents us from concluding which is most likely.
