Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...248l.109l&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 248, Sept. 15, 1981, p. L109-L112.
Astronomy and Astrophysics
Astrophysics
26
Emission Spectra, Forbidden Bands, Galactic Nuclei, Milky Way Galaxy, Oxygen Spectra, Astronomical Models, Astronomical Spectroscopy, H Ii Regions, Hydrogen Ions, Ionic Collisions, Ionized Gases, Line Spectra, Neutral Gases, Spectral Resolution, Velocity Distribution
Scientific paper
The detection of the 63 micron line of forbidden line O I is reported for three positions in the H II region complex Sgr A at the galactic center. Velocity resolution of the line indicates that the emitting material has both rotational and radial motion of magnitude similar to that of the ionized gas in the core, and that a substantial amount of the emitting material lies within the central few parsecs of the Galaxy. A model in which forbidden line O I is collisionally excited by neutral hydrogen, either from the warm region ahead of an ionization front or behind a shock, is proposed and gives a total mass of hot, neutral gas within the central 3 pc of the Galaxy of between 10 and 1000 solar mass. A limit on the flux of this line has been set for Sgr B2.
Lester Dan F.
Storey John W. V.
Townes Charles H.
Watson Dan M.
Werner Michael W.
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