Ammonia toward DR21 - A weak maser in ortho-NH3?

Details Ammonia toward DR21 - A weak maser in ortho-NH3? Ammonia toward DR21 - A weak maser in ortho-NH3?

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...124..322g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 124, no. 2, Aug. 1983, p. 322-325. Research supported by the Centre National d

Astronomy and Astrophysics

Astrophysics

43

Ammonia, Interstellar Masers, Molecular Clouds, Line Spectra, Molecular Energy Levels, Molecular Excitation

Scientific paper

Measurements of the (J,K) = (1,1), (2,2), (3,3), and (4,4) rotation-inversion doublet lines of NH3, made with the 100-m telescope toward the thermal continuum source DR 21 are presented. The results show absorption in the (1,1) and (2,2), neither absorption nor emission in the (4,4) lines of para-NH3, and emission from the (3,3) line of ortho-NH3. The authors interpret these results in terms of deviations from LTE in the population of the (3,3) doublet. Additonal measurements of the (3,3) line with the VLA yield an upper limit of 30K to the line emission. From this the authors conclude that the deviations in the population of the (3,3) levels are small. The deviations can be caused by allowed collisions which transfer population between the (J,K) = (1,0), (2,0) or (3,0) and (3,3) levels of ortho-NH3.

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