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Galactic fine-structure lines - Morphologies of the warm ionized interstellar mediumFar-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.
Document ID
19930046722
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Petuchowski, S. J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Bennett, C. L.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 16, 2013
Publication Date
March 10, 1993
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 405
Issue: 2
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
93A30719
Distribution Limits
Public
Copyright
Other

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