Formaldehyde as a density probe of interstellar clouds

Details Formaldehyde as a density probe of interstellar clouds Formaldehyde as a density probe of interstellar clouds

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982phdt.........5f&link_type=abstract

Ph.D. Thesis Kentucky Univ., Lexington.

Mathematics

Formaldehyde, Gas Density, Interstellar Gas, Interstellar Matter, Molecular Clouds, Hydrogen, Mathematical Models, Radii, Turbulence

Scientific paper

Models of radiative transfer in nonuniform spherical interstellar clouds were constructed for several rotational spectral lines of orthoformaldehyde using the microturbulent approximation. The integrated intensities, TA delta V were calculated and compared to the observed integrated intensities from three interstellar clouds: L183, L134, and B361. Comparison between the model cloud calculations and observations yield the molecular hydrogen gas density as a function of source radius and the relative formaldehyde to molecular hydrogen abundance. The success of the models in uniquely fitting the observations lends support to the idea that the microturbulence is the major line broadening mechanism in dark interstellar clouds.

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