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The contribution of foreground light along the line-of-sight is calibrated using dust emission observations, assuming that the dust sits in a layer close to the mid-plane of the face-on galaxy. The method measures the dust attenuation in optical bands on a pixel-by-pixel basis against a smoothed, reconstructed stellar distribution. We present a new dust extinction technique with which we are able to retrieve parsec-scale gas surface density maps for entire nearby galaxies.

Smith chart full pdf