Ammonia observations of DR 21, W51, NGC 1333, and other sources

Details Ammonia observations of DR 21, W51, NGC 1333, and other sources Ammonia observations of DR 21, W51, NGC 1333, and other sources

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...241..655m&link_type=abstract

Astrophysical Journal, Part 1, vol. 241, Oct. 15, 1980, p. 655-675.

Astronomy and Astrophysics

Astronomy

25

Ammonia, Astronomical Spectroscopy, Interstellar Gas, Molecular Clouds, Nebulae, Molecular Excitation, Radio Sources (Astronomy), Supernova Remnants, Temperature Gradients, Thermodynamic Equilibrium

Scientific paper

The ammonia clouds in DR 21, W51, NGC 1333, NGC 2264, L134 N, and S140 have been mapped in several transitions. Ammonia has also been detected in several other sources as well. The DR 21 data reveal a long, narrow emission ridge and suggest a slight anomaly in the NH3(1,1) satellite emission, as was previously predicted. The validity of the single-temperature local thermodynamic equilibrium (LTE) model is discussed, and curves describing the effect of a gradient in excitation temperature are presented.

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