Detection of [O I] λ6300 emission from the diffuse interstellar medium

被引：60

作者：

Reynolds, RJ ^{[1
]}

Hausen, NR ^{[1
]}

Tufte, SL ^{[1
]}

Haffner, LM ^{[1
]}

机构：

[1] Univ Wisconsin, Dept Astron, Madison, WI 53706 USA

来源：

ASTROPHYSICAL JOURNAL | 1998年 / 494卷 / 01期

基金：

美国国家科学基金会;

关键词：

ISM; atoms; clouds; general; H II regions;

D O I：

10.1086/311154

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The Wisconsin H alpha Mapper facility was used to obtain spectra of [O I] lambda 6300 in three directions that sample the warm ionized component of the interstellar medium at the Galactic midplane and at z similar or equal to -300 pc. Weak interstellar [O I] emission was clearly detected toward all three directions, with [O I] lambda 6300/H alpha 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]/H alpha ratios suggest that most of the H alpha 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.

引用

页码：L99 / L102

页数：4

共 22 条

[1] EFFECTIVE COLLISION STRENGTHS FOR FORBIDDEN TRANSITIONS IN E-N AND E-O SCATTERING [J].