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arXiv 1907.12295astro-ph.GA
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通过对HI吸收光谱的分析,确定了SNR G16 .7+0.1和G15 .9+0.2的运动距离

The kinematic distances of SNR G16.7+0.1 and G15.9+0.2 by analyzing HI absorption spectra

W. W. Tian, H. Zhu, M. F. Zhang, H. K. Chang, S. S. Shan, D. A. Leahy

摘要:

利用THOR巡天数据建立了超新星遗迹G16.7+0.1和G15.9+0.2的HI吸收谱。利用吸收光谱,我们给出了G15.9+0.2的一个新的距离范围为7至16 kpc。我们还解决了G16,7+0.1的近/远侧距离模糊度,并确认其运动学距离约为14 kpc。此外,我们还分析了CO(J=3-2)的G16.7+0.1谱,在20 kms的$^{-1}$ OH 1720 MHz脉泽处发现了明显的CO发射。这支持了Reynoso和Mangum(2000)的观点,即脉泽和南部分子云之间的速度差是由激波加速引起的。我们讨论的距离上的其他物理参数的两个SNR的影响。

英文摘要:

We build HI absorption spectra towards Supernova Remnant (SNRs) G16.7+0.1 and G15.9+0.2 using the THOR survey data. With the absorption spectra, we give a new distance range of 7 to 16 kpc for G15.9+0.2. We also resolve the near/far-side distance ambiguity of G16,7+0.1 and confirm its kinematic distance of about 14 kpc. In addition, we analyze the CO (J=3-2) spectra towards G16.7+0.1 and find obvious CO emission at the 20 kms$^{-1}$ OH 1720 MHz maser site. This supports Reynoso and Mangum (2000)'s suggestions that the velocity difference between the maser and southern molecular cloud is caused by the shock acceleration. We discuss the impact of the distances on other physical parameters of the two SNRs.

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