VLA observations of the 6 CM and 2 CM lines of H2CO in the direction of DR 21

Details VLA observations of the 6 CM and 2 CM lines of H2CO in the direction of DR 21 VLA observations of the 6 CM and 2 CM lines of H2CO in the direction of DR 21

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...162..221d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 162, no. 1-2, July 1986, p. 221-231.

Astronomy and Astrophysics

Astronomy

23

Formaldehyde, Molecular Clouds, Nebulae, Radio Sources (Astronomy), Absorption Spectra, Astronomical Maps, Centimeter Waves, Gas Density, H Ii Regions

Scientific paper

The molecular core of the galaxy DR 21 was scanned at 6 cm and 2 cm with the VLA to identify the absorbing gases in the region and to characterize the accompanying physical properties. A radiative transfer equation was developed for interpreting the transition data obtained, which were also used to generate continuum and formaldehyde distribution maps for the region. A comparison of the optical depths at the two wavelengths was employed to estimate the volume density of H2 and the abundance of ortho H2CO as functions of the H2/velocity gradient of ortho H2CO. A mean H2 density of 80,000/cu cm was determined. The H2 density and volume density and the relative abundance of ortho H2CO varied across the region. The most compact H II region exhibited an H II density of 1-2 x 100,000/cu cm and the lowest abundance of H2CO, i.e., no more than 1/10 billion. The highest ortho H2CO abundance was coincident with a region with the most intense UV output.

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