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arXiv 0812.2186astro-ph
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超新星遗迹G67 .7+1.8及其中心X射线源的X射线发射特性研究

Exploring the X-ray emission properties of the supernova remnant G67.7+1.8 and its central X-ray sources

C. Y. Hui, W. Becker

摘要:

我们用钱德拉X射线天文台对超新星遗迹G67.7+1.8进行了研究。残骸的X射线形态与在无线电波段看到的双弧结构有很好的相关性。G67.7+1.8的南北边缘的X射线谱显示出高电离金属的发射线特征,这表明所观测到的大部分X射线起源于热等离子体。我们发现镁、硅和硫相对于太阳值来说是过剩的。检测到$\sim4$ keV和$\sim7$ keV的高斯发射线。$\sim4$ keV谱线与$^{44}$ Ca和/或$^{44}$ Sc的K发射谱线一致,而$\sim7$ keV谱线特征可能来自未分辨的Fe-K谱线。钱德拉的亚弧秒角分辨率使我们能够探测到位于几何遗迹中心$\sim1.5$弧分之内的四个微弱点源。在这些天体中,CXOU195424.75+312824.9和CXOU195429.82+312834.1没有光学对应物,使它们成为可能的致密恒星遗迹的候选者。

英文摘要:

We have studied the supernova remnant G67.7+1.8 with the Chandra X-ray observatory. The remnant's X-ray morphology correlates well with the double-arc structure seen at radio wavelength. The X-ray spectra of the northern and southern rim of G67.7+1.8 exhibit emission line features of highly ionized metals, which suggests that most of the observed X-rays originate in a thermal plasma. We find magnesium, silicon, and sulphur are overabundant relative to the solar values. Gaussian emission lines at $\sim4$ keV and $\sim7$ keV are detected. The $\sim4$ keV line is consistent with K-emission lines from $^{44}$Ca and/or $^{44}$Sc whereas the $\sim7$ keV line feature may arise from unresolved Fe-K lines. Chandra's sub-arcsecond angular resolution allowed us to detect four faint point sources located within $\sim1.5$ arc-minutes of the geometrical remnant center. Among these objects, CXOU195424.75+312824.9 and CXOU195429.82+312834.1 do not have optical counterparts, leaving them as candidates for a possible compact stellar remnant.

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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