A long filament in the faint galactic H-alpha background

Details A long filament in the faint galactic H-alpha background A long filament in the faint galactic H-alpha background

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...290..238o&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 290, March 1, 1985, p. 238-243.

Other

16

Galactic Radiation, H Alpha Line, Hydrogen Clouds, Interstellar Matter, Nebulae, Background Radiation, Emission Spectra, Filaments, Oxygen Spectra

Scientific paper

Observations of a long narrow emission feature discovered on a map of the faint galactic H-alpha background are studied. The feature is a continuous filament of H-alpha emission about 0.8 deg wide, which has a length of at least 15 deg. It has an emission measure of 2.6 pc/cm to the 6th and a radial velocity of -65 km/s with respect to the LSR. Scans of other spectral lines at two positions along the filament are obtained. The scans of H-alpha, the forbidden lines of N II(6583), S II(6716), O III(5007), and O I(6300) are presented. Shock models by Raymond (1976) and by Shull and McKee (1979) are found to be in good agreement with the observed line ratios for shock velocities of 50 and 90 km/s, respectively. Both shock models predict an H-alpha intensity that is in agreement with the observed H-alpha intensity of the filament if the density of the ambient medium is about 0.3/cu cm.

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