High-resolution X-ray study of supernova remnant J0453.6?6829 with unusually high forbidden-to-resonance ratio
High-resolution X-ray study of supernova remnant J0453.6?6829 with unusually high forbidden-to-resonance ratio
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具有异常高禁共振比的超新星遗迹 J0453.6?6829 的高分辨率 X 射线研究
DOI：
10.1093/pasj/psac033
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发表时间：
2022
影响因子：
2.3
通讯作者：
Tsuru Takeshi Go
中科院分区：
文献类型：
--
作者：
Koshiba Yosuke;Uchida Hiroyuki;Tanaka Takaaki;Amano Yuki;Sano Hidetoshi;Tsuru Takeshi Go
最近的高分辨率X射线光谱显示，大麦哲伦星云(LMC)中的几颗超新星遗迹(SNR)显示出异常高的禁止与共振(f/r)线比。虽然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/或显示出与致密物质相互作用的证据，这可能暗示了异常f/r值的真实性质。在这里，我们报告了一个详细的光谱分析LMC信噪比J0453.6XM6829与反射光栅光谱仪(−)上的XMM-牛顿。我们发现Ovii()的f/r值明显高于先前报道的热模型的预期。除了热成分之外，还考虑了电荷交换(CX)发射，从而适当地解释了光谱。通过分析ATCA和帕克斯的档案无线电数据，我们还发现一颗希考特可能正在与J0453.6−6829相互作用。这些结果支持了J0453.6−6829中Cx的存在，作为获得高f/r比的来源。虽然目前还不能排除共振散射(RS)的贡献，但我们得出结论，考虑到这一残留物的相对对称的形态，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 anomalousf/rratios. Here we report on a detailed spectral analysis of the LMC SNR J0453.6−6829 with the Reflection Grating Spectrometer (RGS) onboard XMM-Newton. We find that thef/rratio of Ovii() is significantly higher than expected from the previously reported thermal model. The spectrum is suitably explained by taking into account a charge exchange (CX) emission in addition to the thermal component. Analyzing archival ATCA and Parkes radio data, we also reveal that an Hicloud is possibly interacting with J0453.6−6829. These results support the presence of CX in J0453.6−6829, as the origin of the obtained highf/rratio. 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.