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arXiv 1405.0939astro-ph.HE
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电荷交换能解释天鹅座环异常软X射线发射吗?

Can Charge Exchange Explain Anomalous Soft X-ray Emission in the Cygnus Loop?

Renata S. Cumbee, David B. Henley, Phillip C. Stancil, Robin L. Shelton, Jeff L. Nolte, Yong Wu, David R. Schultz

摘要:

最近的X射线研究表明,超新星激波模型不能令人满意地解释天鹅座圈边缘的X射线发射。为了解释这种强烈增强的X射线通量,我们用一个模型拟合了该区域,该模型包括理论电荷交换(CX)数据以及冲击和背景X射线模型。该模型包括能量为1 keV/u(438 km/s)的$O^{8+}$、$O{7+}$、$N^{7+}$、$N^{6+}$、$C^{6+}$和$C^{5+}$与H的CX碰撞。观测结果显示,在0.7千电子伏附近有一个很强的发射特征,这一特征不能完全用冲击模型来解释,也不能用当前的CX数据来解释。纳入CX,特别是$O^{7+} + H$,与纯休克模型相比,确实提供了统计学上显著的改善。

英文摘要:

Recent X-ray studies have shown that supernova shock models are unable to satisfactorily explain X-ray emission in the rim of the Cygnus Loop. In an attempt to account for this anomalously enhanced X-ray flux, we fit the region with a model including theoretical charge exchange (CX) data along with shock and background X-ray models. The model includes the CX collisions of $O^{8+}$, $O{7+}$, $N^{7+}$, $N^{6+}$, $C^{6+}$, and $C^{5+}$ with H with an energy of 1 keV/u (438 km/s). The observations reveal a strong emission feature near 0.7 keV that cannot fully be accounted for by a shock model, nor the current CX data. Inclusion of CX, specifically $O^{7+} + H$, does provide for a statistically significant improvement over a pure shock model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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