The forbidden line of S II lambda 6716 in the galactic emission-line background

view Abstract Citations (155) References (28) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS S II lambda 6716 in the galactic emission-line background. Reynolds, R. J. Abstract 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. Publication: The Astrophysical Journal Pub Date: July 1985 DOI: 10.1086/163294 Bibcode: 1985ApJ...294..256R Keywords: 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; Astrophysics full text sources ADS | data products SIMBAD (14)