Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...146..134h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 146, no. 1, May 1985, p. 134-138.
Astronomy and Astrophysics
Astrophysics
27
Ammonia, Gas Temperature, Interstellar Gas, Molecular Clouds, Nitrogen 15, Astronomical Spectroscopy, Optical Thickness, Radial Velocity, Ratios, Spectral Line Width
Scientific paper
The six metastable inversion lines (J,K) = (1,1) to (6,6) of the rare isotopic species of ammonia, 15NH3, have been measured toward Orion-KL. The radial velocities of the 15NH3 lines agree with those of the Hot Component of 14NH3, at 6 km s-1. Assuming that the 15NH3 is optically thin and all lines fill the same volume, the authors derive rotational temperatures TR = 110±10K from the four lines of para and TR = 115±15K from the two lines of ortho 15NH3. Model calculations for H2 densities of 107cm-3 show that this should be the kinetic gas temperature. Using these rotational temperatures, the authors calculate an ortho/para ratio for 15NH3 of 0.7 (+0.5,-0.3); the LTE value is one. If both the 14NH3 and 15NH3 fill the same volume the authors derive a 14N/15N ratio of 170 (+140,-80).
Batrla Wolfgang
Hermsen Willem
Walmsley Charles Malcolm
Wilson Thomas L.
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