Detection of [O i] lambda 6300 Emission from the Diffuse Interstellar Medium

Details Detection of [O i] lambda 6300 Emission from the Diffuse Interstellar Medium Detection of [O i] lambda 6300 Emission from the Diffuse Interstellar Medium

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...494l..99r&link_type=abstract

Astrophysical Journal Letters v.494, p.L99

Astronomy and Astrophysics

Astronomy

39

Ism: Atoms, Ism: Clouds, Ism: General, Ism: H Ii Regions

Scientific paper

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~=-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.

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