CS 5-4 observations of OMC1 - Evidence for external heating of the quiescent gas

Details CS 5-4 observations of OMC1 - Evidence for external heating of the quiescent gas CS 5-4 observations of OMC1 - Evidence for external heating of the quiescent gas

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.214..251p&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 214, May 15, 1985, p. 251-270.

Astronomy and Astrophysics

Astronomy

12

Astronomical Models, Astronomical Spectroscopy, Carbon 12, Gas Temperature, Molecular Clouds, Sulfur Isotopes, Brightness Distribution, Brightness Temperature, Carbon Monoxide, Jeans Theory, Kinetic Heating, Temperature Gradients

Scientific paper

Observations of the center of OMC1 obtained in the J = 5-4 transitions of CS and C(S-34) using the A heterodyne receiver and the Schottky-diode mixer and frequency multiplier described by Ellison and Vizard (1983) at the f/9 Cassegrain focus of the UK IR Telescope at Mauna Kea on August 17-22, 1983, and in the J = 2-1 transitions using the 11-m telescope at KPNO on February 3-4, 1982, are reported. The data are presented graphically and analyzed to characterize the structure and excitation of the ridge clouds, the doughnut, and the hot core. The results are found to confirm the clumpy or turbulent nature of the high-velocity doughnut and to predict a ridge-gas excitation temperature of 15-35 K. The higher temperatures observed in optically thick CO (Plambeck and Williams, 1979) are attributed to heating of a thin layer on the near side of the cloud by radiation from stars in M42 and Trapezium.

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