Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...294..256r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 294, July 1, 1985, p. 256-262.
Astronomy and Astrophysics
Astrophysics
123
Background Radiation, Forbidden Transitions, Galactic Radiation, Interstellar Matter, Line Spectra, Nebulae, Emission Spectra, H Alpha Line, H Ii Regions, Radial Velocity, Spectral Line Width, Sulfur
Scientific paper
The forbidden line of S II has been detected at a wavelength lambda 6716 in the galactic background with an intensity relative to H alpha that is approximately four times higher than that observed in traditional H II regions. This result is the first strong evidence that the emission line spectrum of the faint background is significantly different from that of H II regions. It implies that scattered light from H II regions is not the dominant source of the background emission and that the ionization/excitation conditions within the regions that produce this background differ from the conditions in traditional H II regions. An analysis of the H alpha and S II forbidden line widths suggests that the emitting gas has a temperature of less than about 20,000 K and that the individual emission regions have random velocities typically less than about 30 km/s.
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