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Observations of globules and dark clouds in the CO $J$ = 3-2 and $J$ = 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 $J$ = 3-2 and $J$ = 2-1 lines. The Astrophysical Journal, 312 pp. 848–859.

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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.

Item Type: Article
Copyright Holders: 1987 The American Astronomical Society
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/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 31834
Depositing User: G. J. White
Date Deposited: 10 Feb 2012 10:34
Last Modified: 28 Nov 2016 14:16
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