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arXiv 1808.09082astro-ph.GA
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21颗超新星遗迹的距离

Revised Distances to 21 Supernova Remnants

S. Ranasinghe, D. A. Leahy

摘要:

对21个超新星遗迹的HI 21 cm线观测和$^{13}$ CO线观测进行了综合研究。这项研究的目的是寻找HI吸收功能,以获得一致的方式运动学距离。这21个SNR位于甚大阵银道面巡天(HI 21 cm观测)和银道环巡天($^{13}$ CO线观测)所覆盖的天区。我们根据HI和$^{13}$ CO观测中的新证据获得了10个SNR的修正距离。我们根据更新的旋转曲线和新的误差分析修改了其他11个SNR的距离。21个SNR的平均距离变化为$\simeq25\%$,即与样本的平均距离6.4 kpc相比,变化为1.5 kpc。这对这些SNR的物理状态的解释有重大影响。例如,使用Sedov模型,年龄和爆炸能量比例为距离的平方,推断的ISM密度比例为距离。

英文摘要:

We carry out a comprehensive study of HI 21 cm line observations and $^{13}$CO line observations of 21 supernova remnants (SNRs). The aim of the study is to search for HI absorption features to obtain kinematic distances in a consistent manner. The 21 SNRs are in the region of sky covered by the Very Large Array Galactic Plane Survey (HI 21 cm observations) and Galactic Ring Survey ($^{13}$CO line observations). We obtain revised distances for 10 SNRs based on new evidence in the HI and $^{13}$CO observations. We revise distances for the other 11 SNRs based on an updated rotation curve and new error analysis. The mean change in distance for the 21 SNRs is $\simeq25\%$, i.e. change of 1.5 kpc compared to a mean distance for the sample of 6.4 kpc. This has a significant impact on interpretation of the physical state of these SNRs. For example, using a Sedov model, age and explosion energy scale as the square of distance, and inferred ISM density scales as distance.

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