Observations of the J = 2-1 CO line in molecular clouds near compact H/+/ regions

Details Observations of the J = 2-1 CO line in molecular clouds near compact H/+/ regions Observations of the J = 2-1 CO line in molecular clouds near compact H/+/ regions

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.199..197r&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 199, Apr. 1982, p. 197-209. Research supported by the Science Research

Astronomy and Astrophysics

Astronomy

19

Astronomical Spectroscopy, Carbon Monoxide, Hydrogen Clouds, Molecular Clouds, Optical Transition, Spectral Line Width, Ammonia, Autocorrelation, Hydrogen Ions, Infrared Astronomy, Self Absorption

Scientific paper

Observations of the J = 2-1 transitions of (C-12)O and (C-13)O at 230 and 220 GHz in 13 molecular clouds near compact H(+) regions have been made at UKIRT using an uncooled Schottky diode mixer and a digital autocorrelation spectrometer. The sources were chosen on the basis of their ammonia emission. A comparison between (C-12)O and (C-13)O spectra reveals a variety of self-absorption effects, ranging from slight asymmetries in the (C-12)O profiles relative to their (C-13)O counterparts (W43S, S88), to a deep narrow self-absorption dip (S68). The asymmetry observed in six sources out of ten is most easily explained if the clouds are collapsing; there is no clear evidence for expansion. The (C-13)O linewidths are systematically wider than those from the NH3 cores, suggesting that the velocity dispersion in the sources increases with distance from the center.

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