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.

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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