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The dust mask is the most obvious of the masks that obscure our view of the Milky Way. But there are others, including the mass mask, kinematical masks, and structural, chemical and dynamical masks. In each case, there are ways to penetrate the mask.
Most of the gas in spirals could be lying beyond the optical disk and escape detection through CO observations for being metal poor and cold. We present three perspectives on this hypothesis: (1) Observations of molecular clouds in the SMC which illustrate the limits of CO at tracing molecular gas with low metallicity. (2) Dust observations suggesting the presence of a molecular gas mass beyond the...
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