Models of molecular cloud cores. III - A mulitransition study of H2CO

Details Models of molecular cloud cores. III - A mulitransition study of H2CO Models of molecular cloud cores. III - A mulitransition study of H2CO

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...318..392m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 318, July 1, 1987, p. 392-409.

Astronomy and Astrophysics

Astrophysics

57

Astronomical Models, Electron Transitions, Formaldehyde, Molecular Clouds, Abundance, Emission Spectra, Ground State, Interstellar Matter, Molecular Energy Levels

Scientific paper

The dense cores of the M17, S140, and NGC2024 molecular clouds are studied on the basis of observations of six ortho-H2CO transitions. The observations were fitted to a grid of spherical LVG models so that the gas density and ortho-H2CO column density could be derived at many positions in each core. The resulting densities (about 1 million/cu cm) agree well with those derived from CS and C(S-34). The column density of H2CO is constant on average for densities above 10,000/cu cm, implying that either the H2CO abundance or the volume filling factor of the dense gas decreases with increasing density.

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