Neutral gas contributions to (S II) emission

Details Neutral gas contributions to (S II) emission Neutral gas contributions to (S II) emission

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...438..735p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 438, no. 2, p. 735-739

Astronomy and Astrophysics

Astrophysics

10

Forbidden Bands, Interstellar Gas, Photoionization, Spectral Emission, Sulfur, Supernova Remnants, Electron Density (Concentration), H Alpha Line, Milky Way Galaxy, Molecular Excitation, Nitrogen, Oxygen

Scientific paper

Emission in the forbidden lines of ionized sulfur arises in both predominantly ionized and predominantly neutral regions. The separation of (S II) emission from supernova remnants into nearly orthogonal dependences on (O I) and a power of (N II)/H alpha is discussed. (S II) may be excited via photoionization into forbidden-line-emitting states in regions devoid of electronic excitation of (O I). Emission along 'background' lines of sight in the Milky Way and in extragalactic 'froth' is considered in terms of contributions of neutral gas.

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