Abstract
The relationships among IR emission, CO isotope intensities, and visual extinction in the molecular cloud Barnard 5 are studied in order to evaluate various candidates as mass tracers or molecular material and to determine the properties of dust grains emitting at 60 and 100 microns. The results establish a strong correlation between the 100 micron dust opacity and the (C-13)O column density. This relationship should allow for tracing the molecular gas with the 100 and 60 micron emission in regions without strong embedded heat sources. For single homogeneous clouds, (C-13)O is the best CO tracer of mass and gives the best estimate of virial mass. The mass of B5 estimated from the (C-13)O luminosity is 930 solar masses, while that of the core and dense fragments is only 200 solar masses. An algorithm is developed for calculating the virial mass of a cloud based on observation of optically thin lines.
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