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<i>Planck</i>early results. XIX. All-sky temperature and dust optical depth from<i>Planck</i>and IRAS. Constraints on the “dark gas” in our Galaxy
An all sky map of the apparent temperature and optical depth of thermal dust emission is constructed using the Planck-HFI (350μm to 2 mm) andIRAS(100μm) data. The optical depth maps are correlated with tracers of the atomic (Hi) and molecular gas traced by CO. The correlation with the column density …