VLA observations of DR 21 NH3 /1, 1/ absorption - Direct evidence for clumping

Details VLA observations of DR 21 NH3 /1, 1/ absorption - Direct evidence for clumping VLA observations of DR 21 NH3 /1, 1/ absorption - Direct evidence for clumping

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...250l..85m&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 250, Nov. 15, 1981, p. L85-L89. Research supported by the Statens Na

Astronomy and Astrophysics

Astronomy

27

Absorption Spectra, Ammonia, Interstellar Gas, Molecular Clouds, Radio Astronomy, Radio Telescopes, Antenna Arrays, Brightness Distribution, Data Reduction, Hydrogen Clouds, Optical Thickness

Scientific paper

The (1, 1) transition of NH3 was observed in absorption against DR 21 with a synthesized beam of 2-second size at the VLA. The DR 21 continuum is resolved by the VLA into components distributed within a range of about 30 seconds, but only the brightest (and most southerly) component is absorbed by NH3. The indicated filling factor and optical depth of the absorption feature are consistent with a model suggested by emission results, ammonia existing in optically thick thermalized clumps. One of these would be producing the observed absorption.

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