A GIANO-TNG high-resolution infrared spectrum of the airglow emission

A GIANO-TNG high-resolution infrared spectrum of the airglow emission
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气辉发射的 GIANO-TNG 高分辨率红外光谱

DOI:
10.1051/0004-6361/201321366
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发表时间:
2013
影响因子:
6.5
通讯作者:
Oliva E
Oliva E
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Oliva E

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目标气辉发射的通量校准高分辨率光谱是天文光谱观测的实用λ校准参考。它对于约束 OH 分子的分子参数和上层中间层的物理条件也很有用。方法我们使用了在国家伽利略望远镜 (TNG) 首次技术调试 GIANO 摄谱仪期间收集的数据。高分辨率 (R≃ 50   000) 光谱同时覆盖 0.95–2.4μm 波长范围。相对通量校准是通过同时观察分光光度标准星来实现的。结果我们得出了 OH 红外线的改进位置和强度的列表。该列表包括 Λ 分裂双峰,其中许多是光谱解析的。与之前的工作相比,新结果纠正了 Q 分支跃迁波长中的错误。来自不同振动带的 OH 谱线的相对通量与理论预测存在显着偏差:Δv= 3、4 谱线比预期亮 2 倍和 4 倍。我们还发现了很大一部分 (1-4%) OH 分子具有高 J 水平非热群体的证据。最后,我们列出了 153 条不属于 OH 的谱线的波长和通量。其中大部分可以与 O2 相关,而 H 带中的 37 个谱系尚未鉴定。 H 波段中的 O2 和未识别谱线占该波段总气辉通量的≃5%。
AimsA flux-calibrated high-resolution spectrum of the airglow emission is a practicalλ-calibration reference for astronomical spectral observations. It is also useful for constraining the molecular parameters of the OH molecule and the physical conditions in the upper mesosphere.MethodsWe used the data collected during the first technical commissioning of the GIANO spectrograph at the Telescopio NazionaleGalileo(TNG). The high-resolution (R≃ 50   000) spectrum simultaneously covers the 0.95–2.4μm wavelength range. Relative flux calibration is achieved by the simultaneous observation of a spectrophotometric standard star.ResultsWe derived a list of improved positions and intensities of OH infrared lines. The list includes Λ-split doublets, many of which are spectrally resolved. Compared with previous works, the new results correct errors in the wavelengths of the Q-branch transitions. The relative fluxes of OH lines from different vibrational bands show remarkable deviations from theoretical predictions: the Δv= 3, 4 lines are a factor of 2 and 4 brighter than expected. We also found evidence of a significant fraction (1–4%) of OH molecules with a non-thermal population of high-Jlevels. Finally, we list wavelengths and fluxes of 153 lines not attributable to OH. Most of these can be associated with O2, while 37 lines in theHband are not identified. The O2and unidentified lines in theHband account for ≃5% of the total airglow flux in this band.
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