论文标题
银河超新星残留物的高分辨率近红外光谱研究。 I.运动学距离
High-resolution Near-infrared Spectroscopic Study of Galactic Supernova Remnants. I. Kinematic Distances
论文作者
论文摘要
我们对16个银河超新星残留物（SNR）进行了高分辨率的近红外光谱观测，显示了强大的H $ _ {2} $排放特征。对于单个SNR，清楚地检测到了十二个明亮的H $ _ {2} $发射线，我们测量了它们的中心速度，线宽度和磁通量。对于除一个（g9.9 $ - $ 0.8）以外的所有SNR，H $ _ {2} $线比与$ t \ sim2000 $ k的热激发符合度符合，这表明h $ _ {2} $发射线最有可能来自震动的气体，因此它们与恢复量相关。 15个SNR的运动学距离源自使用银河旋转模型的H $ _ {2} $线的中央速度。我们首次将运动距离派往四个SNR：G13.5 $+$ 0.2，G16.0 $ - $ 0.5，G32.1 $ - $ 0.9和G33.2 $ 0.6。在其余的11个SNR中，六个SNR的H $ _ {2} $排放线的中心速度非常一致（$ \ pm5 $ km s $ s $^{ - 1} $）与以前的无线电观察结果相关的速度非常一致有显着差异。我们讨论了这五个SNR中的速度差异。在g9.9 $ - $ 0.8中，h $ _ {2} $排放显示非热线比和窄线宽度（$ \ sim 4 $ km s $ s $^{ - 1} $），我们讨论了其来源。
We have carried out high-resolution near-infrared spectroscopic observations toward 16 Galactic supernova remnants (SNRs) showing strong H$_{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.
