Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...227..415s&link_type=abstract
Astrophysical Journal, Part 1, vol. 227, Jan. 15, 1979, p. 415-421.
Astronomy and Astrophysics
Astronomy
6
Ammonia, Interstellar Matter, Microwave Emission, Molecular Spectra, Nebulae, Radio Sources (Astronomy), Far Infrared Radiation, Molecular Excitation, Molecular Rotation, Radial Velocity
Scientific paper
Results are reported for observations of microwave inversion radiation from short-lived excited rotational states (nonmetastable levels) of NH3 toward the Kleinmann-Low nebula (KLN) in Orion and toward Sgr B2. Emission from the (J, K) = (2, 1), (3, 2), (4, 3), and probably the (5, 4) inversion transitions were detected in the direction of the KLN; the (2, 1) line was detected toward Sgr B2, and negative results were obtained for six additional sources. Modeling of the observations indicates that the NH3 source in the KLN is small (about 10 to the 17th cm) and relatively hot (approximately 53.9 K), if LTE is a reasonable approximation, and that Sgr B2 appears to be extended (3 x 10 to the 19th cm) in the (2, 1) line and is relatively cool (no more than about 48 K), if the far-IR continuum excites the NH3. The results imply lower limits to the gas mass of 1 solar mass for the core of the KLN and 600,000 solar masses for the cool gas cloud in Sgr B2
Morris Marita
Palmer Patrick
Sweitzer J. S.
Turner Barry E.
Zuckerman Ben
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