Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...266..331c&link_type=abstract
Astrophysical Journal, Part 1, vol. 266, Mar. 1, 1983, p. 331-338.
Astronomy and Astrophysics
Astrophysics
39
Cyanides, Interstellar Matter, Methyl Compounds, Molecular Clouds, Nebulae, Acetonitrile, Astronomical Models, Collision Rates, Density (Number/Volume), Line Spectra, Molecular Rotation, Spectrum Analysis, Temperature Measurement
Scientific paper
Observations of the K components of the CH3CN J = 4-to-3 rotational transition at 73.6 GHz, the 6-to-5 transition at 110.4 GHz, and the 7-to-6 transition at 128.7 GHz, yield a mean kinetic temperature value of 85 + or - 10 K and a mean H2 density of 110,000 + or - 50,000/cu cm for the central 2.0 arcmin of the Sgr B2 molecular cloud. Within the K = zero-to-4 ladders of CH3CN in Sgr B2, the populations of the radiatively coupled J levels are relaxed and exhibit a rotational temperature of about 16 K, which is similar to that of several linear molecules.
Cummins S. E.
Green Shaun
Linke Richard A.
Thaddeus Patrick
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