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We present an Atacama Large Millimeter/submillimeter Array (ALMA) Cycle 0survey of 126 submillimeter sources from the LABOCA ECDFS Submillimeter Survey(LESS). Our 870 micron survey with ALMA (ALESS) has produced maps ~3X deeperand with a beam area ~200X smaller than the original LESS observations,doubling the current number of interferometrically-observed submillimetersources. The high resolution of these maps allows us to resolve sources thatwere previously blended and accurately identify the origin of the submillimeteremission. We discuss the creation of the ALESS submillimeter galaxy (SMG)catalog, including the main sample of 99 SMGs and a supplementary sample of 32SMGs. We find that at least 35% (possibly up to 50%) of the detected LABOCAsources have been resolved into multiple SMGs, and that the average number ofSMGs per LESS source increases with LESS flux density. Using the (now preciselyknown) SMG positions, we empirically test the theoretical expectation for theuncertainty in the single-dish source positions. We also compare our catalog tothe previously predicted radio/mid-infrared counterparts, finding that 45% ofthe ALESS SMGs were missed by this method. Our ~1.6" resolution allows us tomeasure a size of ~9 kpc X 5 kpc for the rest-frame ~300 um emission region inone resolved SMG, implying a star formation rate surface density of 80 M_solyr^-1 kpc^-2, and we constrain the emission regions in the remaining SMGs to be<10 kpc. As the first statistically reliable survey of SMGs, this will providethe basis for an unbiased multiwavelength study of SMG properties.

An ALMA survey of submillimeter galaxies in the Extended Chandra Deep Field South: Source catalog and multiplicity