Galactic fine-structure lines - Morphologies of the warm ionized interstellar medium

Astronomy and Astrophysics – Astrophysics

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Fine Structure, H Ii Regions, Interstellar Gas, Ionized Gases, Line Spectra, Milky Way Galaxy, Carbon, Cosmic Background Explorer Satellite, Molecular Clouds, Nitrogen Ions, Photodissociation

Scientific paper

Far-infrared ionic fine-structure emission lines associated with the large-scale structure of the Galactic ionized medium are interpreted in terms of a heuristic model in which three distinct source morphologies are considered: ionization-bounded H II regions, an extended, low-density medium, and externally ionized surfaces of neutral clouds. The model reveals that the overall luminosity of the Galaxy in the fine-structure lines of both C II and N II is due, in comparable proportions, to diffuse medium and the boundaries between ionized and neutral regions. Limits are set on the luminosity of the diffuse component in the plane of the Galaxy. Some individual lines of sight of the COBE FIRAS instrument are dominated, in these spectral lines, by H II regions, even with its 7 deg field of view. Average densities of both H II regions and photodissociation regions are estimated on a Galactic scale.

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