Heterodyne spectroscopy of the J = 17-16 CO line in Orion

Details Heterodyne spectroscopy of the J = 17-16 CO line in Orion Heterodyne spectroscopy of the J = 17-16 CO line in Orion

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...337..332b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 337, Feb. 1, 1989, p. 332-341.

Astronomy and Astrophysics

Astrophysics

18

Carbon Monoxide, Interstellar Matter, Optical Heterodyning, Orion Nebula, Density (Number/Volume), Molecular Excitation

Scientific paper

High-resolution spectra of the 153 micron J = 17-16 CO line in the BN-KL region of Orion using a laser heterodyne spectrometer are obtained. The line shows broad wings characteristic of the plateau emission as well as a narrower component probably associated with the quiescent gas in the molecular ridge. From an analysis of the plateau emission together with that observed in lower J CO transitions, an excitation temperature of 180 + or - 50 K and minimum column density of 1 x 10 to the 18th /sq cm are derived for CO in this component, which constitutes 80 percent of the total integrated intensity of the J = 17-16 line near BN. The peak intensity of the narrower component observed at 0.8 km/s resolution increases relative to that of the plateau component toward theta 1C and away from BN, while the width decreases from 10 to 4 km/s (FWHM).

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