论文标题
狭缝配置对h $ _2 $ 1-0〜S（1）对BR $γ$线的线路比的影响
The Effect of the Slit Configuration on the H$_2$ 1-0~S(1) to Br$γ$ Line Ratio of Spatially Resolved Planetary Nebulae
论文作者
论文摘要
H $ _2 $ 1-0〜S（1）/BR $γ$比率（R（Br $γ$））用于行星星云（Planetary Nebulae（PNE）中的分子含量）中。由于这些线是在不同区域产生的，因此光谱观测中使用的缝隙构型可能对其比率产生重要影响。在这项工作中，观察结果和数值模拟用于证明和量化PNE的这种影响。该研究旨在帮助解释观察结果及其与模型的比较。分析表明，当缝隙包含整个星云时，观察到的R（Br $γ$）比仅达到0.3。仅当缝隙覆盖h $ _2 $峰值排放和BR $γ$排放量周围的有限区域时才获得的值高于该值。提出的数值模拟表明，当考虑到狭缝配置的效果时，光电离模型可以重现PNE中观察到的R（BR $γ$）的整个范围，以及上述行为。因此，需要冲击来解释R（Br $γ$）的较高值的论点是无效的。因此，该比率不是文献中建议的H $ _2 $激发机制的良好指标。
The H$_2$ 1-0~S(1)/Br$γ$ ratio (R(Br$γ$)) is used in many studies of the molecular content in planetary nebulae (PNe). As these lines are produced in different regions, the slit configuration used in spectroscopic observations may have an important effect on their ratio. In this work, observations and numerical simulations are used to demonstrate and quantify such effect in PNe. The study aims to assist the interpretation of observations and their comparison to models. The analysis shows that observed R(Br$γ$) ratios reach only values up to 0.3 when the slit encompasses the entire nebula. Values higher than that are only obtained when the slit covers a limited region around the H$_2$ peak emission and the Br$γ$ emission is then minimised. The numerical simulations presented show that, when the effect of the slit configuration is taken into account, photoionization models can reproduce the whole range of observed R(Br$γ$) in PNe, as well as the behaviour described above. The argument that shocks are needed to explain the higher values of R(Br$γ$) is thus not valid. Therefore, this ratio is not a good indicator of the H$_2$ excitation mechanism as suggested in the literature.
