Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.187..161f&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 187, Apr. 1979, p. 161-178.
Astronomy and Astrophysics
Astronomy
13
Astronomical Spectroscopy, Formaldehyde, Interstellar Matter, Milky Way Galaxy, Molecular Spectra, Radial Distribution, Absorption Spectra, Carbon Monoxide, Density Distribution, Gas Density, H Ii Regions, Microwave Spectra, Optical Thickness, Radio Spectra, Spiral Galaxies
Scientific paper
Observations of the 4.83 GHz line of formaldehyde along the galactic plane between 8 and 60 degrees galactic longitude are presented. Spectra and longitude-velocity maps of optical depth are used to determine the radial distribution of formaldehyde. The distribution is found to have a peak at about 5.0 kpc from the galactic center, with a decline at longer radii, and a trough at about 3.5 kpc. The molecular hydrogen density inferred from these observations is in agreement with densities determined from observations of CO (0.15/cu cm at the radius of the sun), increasing exponentially towards the galactic center until a radius of 5 kpc. Observed formaldehyde column densities in the directions of strong H II regions are found to be incompatible with the radial distributions determined and observed distributions are consistent with a model in which formaldehyde is concentrated in the spiral arms.
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