Galactic fine-structure lines - Morphologies of the warm ionized interstellar medium
| Autor: | S. J. Petuchowski, Charles L. Bennett |
|---|---|
| Rok vydání: | 1993 |
| Předmět: |
Physics
H II region Milky Way Molecular cloud Astronomy Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Computer Science::Computational Geometry Galaxy Spectral line Luminosity Interstellar medium Space and Planetary Science Emission spectrum Astrophysics::Galaxy Astrophysics |
| Zdroj: | The Astrophysical Journal. 405:591 |
| ISSN: | 1538-4357 0004-637X |
| DOI: | 10.1086/172390 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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