Observations of globules and dark clouds in the CO = 3-2 and = 2-1 lines

Avery, L. W.; White, Glenn J.; Williams, I. P. and Cronin, N. (1987). Observations of globules and dark clouds in the CO = 3-2 and = 2-1 lines. The Astrophysical Journal, 312 pp. 848–859.

DOI: https://doi.org/10.1086/164931

URL: http://articles.adsabs.harvard.edu/cgi-bin/nph-iar...

Abstract

In a search for embedded molecular outflows, nine globules and compact dark clouds, including the known outflow sources B335 and L723, were observed in the ¹²CO J = 2-1 and J = 3-2 lines, and a Monte Carlo radiative transfer code utilizing a combination of microturbulent and velocity gradient line broadening was used to model the flows. Both the known sources are found to be of relatively low density and modest energy. It is found that nH² = 3x10³ cm^-3 in B335 and 1x3x10³ cm^-3 in the L723 high-velocity gas. None of the other seven clouds show clear evidence of bipolar outflows. Models of the globules B68 and B361 suggest efficient carbon isotope fractionation, with the ¹²CO and ¹³CO abundance ratios being 14 and 25, respectively.

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About

• Item ORO ID
• 31834
• Item Type
• Journal Item
• ISSN
• 1538-4357
• Keywords
• astronomical spectroscopy; carbon monoxide; dark matter; globules; line spectra; molecular clouds; line shape; molecular flow; nebulae; radiative transfer; velocity distribution
• Academic Unit or School
• Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
  Faculty of Science, Technology, Engineering and Mathematics (STEM)
• Copyright Holders
• © 1987 The American Astronomical Society
• Depositing User
• G. J. White