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2013MNRAS.431.1296R - Mon. Not. R. Astron. Soc., 431, 1296-1313 (2013/May-2)
CO abundance variations in the Orion Molecular Cloud.
RIPPLE F., HEYER M.H., GUTERMUTH R., SNELL R.L. and BRUNT C.M.
Abstract (from CDS):
Values of the molecular mass of each cloud are independently derived from the distributions of Av and 13CO column densities with a constant 13CO-to-H2 abundance over various extinction ranges. Within the strongly self-shielded interior of the cloud (Av> 3 mag), 13CO provides a reliable tracer of H2 mass with the exception of the cold, dense volumes where depletion is important. However, owing to its reduced abundance, 13CO does not trace the H2 mass that resides in the extended cloud envelope, which comprises 40-50 per cent of the molecular mass of each cloud. The implied CO luminosity to mass ratios, M/LCO, are 3.2 and 2.9 for Orion A and Orion B, respectively, which are comparable to the value (2.9), derived from γ-ray observations of the Orion region. Our results emphasize the need to consider local conditions when applying CO observations to derive H2 column densities.
Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)
Journal keyword(s): ISM: abundances - ISM: clouds - ISM: molecules
Simbad objects: 18
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