Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...351..189d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 351, March 1, 1990, p. 189-205.
Astronomy and Astrophysics
Astrophysics
31
Astronomical Spectroscopy, Formaldehyde, H Ii Regions, Molecular Clouds, Absorption Spectra, Astronomical Models, Centimeter Waves, Continuous Radiation, Emission Spectra, Spectral Line Width, Very Large Array (Vla)
Scientific paper
Formaldehyde absorption at 6 cm and 2 cm toward the radio continuum source W49 has been mapped with the VLA, and Gaussian components have been fitted to the H2CO profiles obtained in the direction of the embedded ultracompact H II regions. The densities of H2 and column densities of ortho-H2CO are derived for the Gaussian range - 2 km/s and + 20 km/s. Large variations in optical depth are observed across the region. The structure and dynamics within the molecular core of W49 are determined. The main features of the results can be explained if the absorption occurs within the dense core of the molecular cloud and arises close to the embedded ultracompact H II regions UC H II.
Dickel Helene R.
Goss William Miller
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