Detection of [O I] λ6300 Emission from the Diffuse Interstellar Medium
Detection of [O I] λ6300 Emission from the Diffuse Interstellar Medium
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DOI：
10.1086/311154
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发表时间：
1998-01
期刊：
影响因子：
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通讯作者：
R. J. Reynolds;N. Hausen;S. Tufte;L. M. Haffner
中科院分区：
文献类型：
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作者：
R. J. Reynolds;N. Hausen;S. Tufte;L. M. Haffner
威斯康星州的Hα Mapper设备被用来获得[O I] λ6300在三个方向上的光谱，这些方向在银河系中平面和z =-300 pc处对星际介质的温暖电离成分进行采样。在所有三个方向上都清晰地探测到了微弱的星际[O I]辐射，单个径向速度分量的[O I] λ6300/Hα强度比从小于0.01到大约0.04不等。根据暖电离介质的光电离模型，这些[O I]/Hα比值表明，大部分Hα起源于沿视线沿着的密度边界的、几乎完全电离的区域，而不是部分电离的H I云或H I云表面的H II层。
The Wisconsin Hα Mapper facility was used to obtain spectra of [O I] λ6300 in three directions that sample the warm ionized component of the interstellar medium at the Galactic midplane and at z≃-300 pc. Weak interstellar [O I] emission was clearly detected toward all three directions, with [O I] λ6300/Hα intensity ratios for individual radial velocity components that range from less than 0.01 to approximately 0.04. According to photoionization models of the warm ionized medium, these [O I]/Hα ratios suggest that most of the Hα originates from density-bounded, nearly fully ionized regions along the lines of sight rather than from partially ionized H I clouds or layers of H II on the surfaces of H I clouds.