High-temperature methyl cyanide in Orion molecular cloud 1

Details High-temperature methyl cyanide in Orion molecular cloud 1 High-temperature methyl cyanide in Orion molecular cloud 1

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...250..573l&link_type=abstract

Astrophysical Journal, Part 1, vol. 250, Nov. 15, 1981, p. 573-578.

Astronomy and Astrophysics

Astrophysics

22

Cyanides, High Temperature Gases, Interstellar Matter, Line Spectra, Methyl Compounds, Molecular Clouds, Acetonitrile, Molecular Rotation, Molecular Spectra, Orion Constellation

Scientific paper

The K = 0 through K = 6 lines of the J = 13-12 and J = 12-11 rotational transitions of methyl cyanide at 239 and 221 GHz are observed toward OMC-1. The relative strengths of the transitions are used to obtain the excitation temperatures of the CH3CN emitting region, and the easily excited K = 0-2 transitions are found to yield 80-12 K, while the K = 4-6 transitions yield 270 K. The low temperature region is characterized by a small CH3CN line width with a velocity dispersion of 5 km/s, and the hot region produces a larger velocity dispersion of 8 km/s. The use of CH3CN as a temperature probe allows the simultaneous observation of transitions of significantly different energy in a single spectral calibration, thus eliminating uncertainties of telescope calibration, sideband gain, or relative pointing in the temperature determination.

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