Astronomy and Astrophysics – Astronomy
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...268..698r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 268, May 15, 1983, p. 698-709.
Astronomy and Astrophysics
Astronomy
64
Galactic Radiation, H Alpha Line, Interstellar Gas, Milky Way Galaxy, Radial Velocity, Background Radiation, Curve Fitting, Diffuse Radiation, Electron Density (Concentration), Emission Spectra, H Ii Regions, Normal Density Functions, Radiant Flux Density, Sky Surveys (Astronomy), Spectral Energy Distribution
Scientific paper
Photographic surveys along the galactic plane, the Palomar Sky Survey red prints, and Fabry-Perot observations have all revealed faint H-alpha emission from the areas between the bright H II regions. The present investigation is concerned with a systematic study of this H-alpha emission. Scans of H-alpha emission were obtained at 2 deg longitude intervals along the galactic equator with a high-throughput Fabry-Perot spectrometer. Much of the H-alpha emission appears to originate from discrete regions which have an electron density of approximately 1-3 per cu cm and which are associated with emission regions visible on photographic surveys. These regions are superposed on a more diffuse H-alpha background which can be accounted for by an rms electron density of approximately 0.1 per cu cm. This H-alpha survey complements radio and photographic data.
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