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Power-law tails are often seen in probability density functions (PDFs) ofmolecular cloud column densities, and have been attributed to the effect ofgravity. We show that extinction PDFs of a sample of five molecular cloudsobtained at a few tenths of a parsec resolution, probing extinctions up toA$_{{\mathrm{V}}}$ $\sim$ 10 magnitudes, are very well described by lognormalfunctions provided that the field selection is tightly constrained to the cold,molecular zone and that noise and foreground contamination are appropriatelyaccounted for. In general, field selections that incorporate warm, diffusematerial in addition to the cold, molecular material will display apparentcore+tail PDFs. The apparent tail, however, is best understood as the highextinction part of a lognormal PDF arising from the cold, molecular part of thecloud. We also describe the effects of noise and foreground/backgroundcontamination on the PDF structure, and show that these can, if notappropriately accounted for, induce spurious tails or amplify any that aretruly present.

Power-law tails in probability density functions of molecular cloud column density