Ratio between the product of the millimeter absorption coefficient κd(1.2 mm) and the dust-to-gas mass ratio xd with the alpha parameter αvir versus xd. This ratio is linearly related to the ratio between the millimeter dust luminosity and the virial mass. The data represent the median values of the κd(1.2 mm)xd/αvir ratio for molecular clouds located in three different environments with different dust-to-gas mass ratio, the Gould Belt in the Milky Way, several regions in the SMC, and the N11 region in the LMC. The error bar is the standard deviation of each population. The values for the molecular clouds in the Gould Belt and the SMC were extracted from Bot et al. (2007). The solid line is the Galactic measurement scaled to different xd values. The shaded area represents the uncertainty on the dust temperature (from 15 to 25 K).
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