A survey of the Cygnus-X region in the H166-alpha recombination line

Astronomy and Astrophysics – Astronomy

Scientific paper

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Cygnus Constellation, H Alpha Line, Hydrogen Recombinations, Radio Sources (Astronomy), Astronomical Maps, Electron Energy, H Ii Regions, Milky Way Galaxy, Molecular Clouds, Radial Velocity, Radio Spectra

Scientific paper

The Cygnus-X region has been surveyed in the H166α recombination line with an angular resolution of 36 arcmin. 123 spectra were obtained on a one-beamwidth grid. Continuum brightness at 1.4 GHz and H I spectra were also measured. Some resemblance is found between the velocity distribution of molecular line and H166α sources. Any correlation with the H I distribution is masked by nearby H I. In their recombination line properties the Cygnus-X H II regions resemble other extended H II regions at comparable galactocentric distances, except that the line profiles in Cygnus-X are broadened by line blending. H166α velocities are uniform across each of two large complexes of molecular clouds and H II regions which were identified by Cong (1977). The interpretation of Cygnus-X as a local feature of galactic structure is discussed.

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