Observations of the motions of the neutral and ionized gas in M8 (NGC 6523)

Details Observations of the motions of the neutral and ionized gas in M8 (NGC 6523) Observations of the motions of the neutral and ionized gas in M8 (NGC 6523)

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...138..451e&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 138, no. 2, Sept. 1984, p. 451-456.

Astronomy and Astrophysics

Astrophysics

17

Astronomical Spectroscopy, Gas Dynamics, Hydrogen Clouds, Ionized Gases, Molecular Clouds, Neutral Gases, Emission Spectra, Interstellar Extinction, Line Spectra, Nitrogen Ions, Oxygen Ions, Sodium, Visible Spectrum

Scientific paper

Profiles of the interstellar absorption Na I lines and the forbidden O III and N II emission lines have been obtained over a large area of the galactic H II, H I, molecular complex of M8. Many separate velocity components are found in each set of profiles. These are compared with each other and with the structural features of M8 that are revealed by filtering low spatial frequencies in enlargements from a Schmidt photograph through forbidden S II. Separate velocity components, in the emission lines over the ionization fronts at the edge of M8, suggest that a neutral and ionized expanding bubble, driven by stellar winds, supernova explosions or radiation pressure cannot be their explanation if the ambient medium is very uniform. However, dense neutral concentrations at the edge of an expanding shell could produce this splitting. On the other hand the large scale motions in the neutral clouds, prior to the formation of M8 could still be present in M8 to give the same effect without the presence of an expanding shell. Some systematic changes in radial velocity over the core could be evidence that localized disturbances are superimposed on the dominant, large-scale, motions.

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