Abstract
The MidCourse Space eXperiment (MSX) surveyed the Galactic plane within 5° latitude in four mid-infrared spectral bands. A set of full resolution (20 '' ) 1.5°×1.5° images on 6'' pixel centers has been created in each spectral band by co-adding all the survey data. A lower (1.2 ' ) resolution atlas of 10°×10° images provide large-scale panoramas of the plane. A new class of objects has been identified in the images, infrared dark clouds, which are silhouetted against the mid-infrared background emission from the interstellar medium in the Galactic plane. The IRAS ISSA plates indicate that these clouds are dark out to 100 μ m. Submillimeter emission traces the form of the dark cloud and reveals cores indicative of class 0 protostars.
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