论文标题
超新星残留J0453.6 $ - $ 6829的高分辨率X射线研究具有异常高的禁用比率
High resolution X-ray study of supernova remnant J0453.6$-$6829 with unusually high forbidden-to-resonance ratio
论文作者
论文摘要
最近的高分辨率X射线光谱表明，大麦哲伦云（LMC）中的几个超新星残留物（SNR）表现出异常高的禁用（$ f/r $）线比率。尽管它们的起源仍然不确定和争论，但这些SNR中的大多数具有不对称的形态和/或显示与密集材料相互作用的证据，这可能暗示了异常$ f/r $ $比率的真实本质。在这里，我们报告了LMC SNR J0453.6 $ - $ 6829的详细光谱分析，其反射光谱仪（RGS）在板上XMM-Newton。我们发现，$ f/r $ $比为O $〜$ vii（$ = 1.06^{+0.09} _ { - 0.10} $）明显高于先前报告的热模型的预期。除热成分外，还考虑了电荷交换（CX）发射，可以公平地解释频谱。分析档案ATCA＆Parkes无线电数据，我们还透露H $〜$ i Cloud可能正在与J0453.6 $ -6829的J0453.6 $ - $ 6829进行交互。这些结果支持J0453.6 $ - $ 6829中CX的存在，作为获得的高$ f/r $ $比例的起源。尽管目前不能排除共振散射（RS）的贡献，但我们得出的结论是，考虑到这种残留物的相对对称形态，CX似乎比RS更有可能。
Recent high-resolution X-ray spectroscopy has revealed that several supernova remnants (SNRs) in the Large Magellanic Cloud (LMC) show unusually high forbidden-to-resonance ($f/r$) line ratios. While their origin is still uncertain and debated, most of these SNRs have asymmetric morphology and/or show evidence of interaction with dense material, which may hint at the true nature of the anomalous $f/r$ ratios. Here we report on a detailed spectral analysis of an LMC SNR J0453.6$-$6829 with the Reflection Grating Spectrometer (RGS) onboard XMM-Newton. We find that the $f/r$ ratio of O$~$VII ($=1.06^{+0.09}_{-0.10}$) is significantly higher than expected from the previously-reported thermal model. The spectrum is fairly explained by taking into account a charge exchange (CX) emission in addition to the thermal component. Analyzing archival ATCA & Parkes radio data, we also reveal that H$~$I cloud is possibly interacting with J0453.6$-$6829. These results support the presence of CX in J0453.6$-$6829, as the origin of the obtained high $f/r$ ratio. Although a contribution of the resonance scattering (RS) cannot be ruled out at this time, we conclude that CX seems more likely than RS considering the relatively symmetric morphology of this remnant.
