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arXiv 2011.07711astro-ph.GA
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银河系超新星遗迹的高分辨率近红外光谱研究。I.运动距离

High-resolution Near-infrared Spectroscopic Study of Galactic Supernova Remnants. I. Kinematic Distances

Yong-Hyun Lee, Bon-Chul Koo, Jae-Joon Lee

摘要:

我们对16个具有强H $_{2}$发射特征的银河系超新星遗迹进行了高分辨率近红外光谱观测。十几个明亮的H $_{2}$发射线被清楚地检测到个别SNR,我们已经测量了他们的中心速度,线宽,和通量。除了一个(G9.9 $-$ 0.8)的SNR,所有的H $_{2}$线比是一致的热激发在$T\sim2000$ K,表明H $_{2}$发射线最有可能从冲击激发的气体,因此,它们是物理上与残留物。利用银河系自转模型,从H $_{2}$线的中心速度导出了到15个SNR的运动学距离。我们首次推导出四个SNR的运动学距离:G13.5 $+$ 0.2,G16.0 $-$ 0.5,G32.1 $-$ 0.9和G33.2 $-$ 0.6。在其余的11个信噪比中,有6个信噪比的H $_{2}$发射线中心速度($\pm5$ km s $^{-1}$)与以往的射电观测结果一致,而另外5个信噪比(G18.1 $-$ 0.1,G18.9 $-$ 1.1,Kes 69,3C 396,W49 B)的H $_{2}$发射线中心速度有显著差异。我们讨论这五个SNR的速度差异。在G9.9 $-$ 0.8中,H $_{2}$发射显示出非热谱线比和窄谱线宽度($\sim 4$ km s $^{-1}$),并讨论了它的起源。

英文摘要:

We have carried out high-resolution near-infrared spectroscopic observations toward 16 Galactic supernova remnants (SNRs) showing strong H$_{2}$ emission features. A dozen bright H$_{2}$ emission lines are clearly detected for individual SNRs, and we have measured their central velocities, line widths, and fluxes. For all SNRs except one (G9.9$-$0.8), the H$_{2}$ line ratios are well consistent with that of thermal excitation at $T\sim2000$ K, indicating that the H$_{2}$ emission lines are most likely from shock-excited gas and therefore that they are physically associated with the remnants. The kinematic distances to the 15 SNRs are derived from the central velocities of the H$_{2}$ lines using a Galactic rotation model. We derive for the first time the kinematic distances to four SNRs: G13.5$+$0.2, G16.0$-$0.5, G32.1$-$0.9, and G33.2$-$0.6. Among the remaining 11 SNRs, the central velocities of the H$_{2}$ emission lines for six SNRs are well consistent ($\pm5$ km s$^{-1}$) with those obtained in previous radio observations, while for the other five SNRs (G18.1$-$0.1, G18.9$-$1.1, Kes 69, 3C 396, W49B) they are significantly different. We discuss the velocity discrepancies in these five SNRs. In G9.9$-$0.8, the H$_{2}$ emission shows nonthermal line ratios and narrow line width ($\sim 4$ km s$^{-1}$), and we discuss its origin.

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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