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We carried out targeted ALMA observations of 129 fields in the COSMOS regionat 1.25 mm, detecting 152 galaxies at S/N$\geq$5 with an average continuum RMSof 150 $\mu$Jy. These fields represent a S/N-limited sample of AzTEC / ASTEsources with 1.1 mm S/N$\geq$4 over an area of 0.72 square degrees. GivenALMA's fine resolution and the exceptional spectroscopic and multiwavelengthphotometric data available in COSMOS, this survey allows us unprecedented powerin identifying submillimeter galaxy counterparts and determining theirredshifts through spectroscopic or photometric means. In addition to 30 sourceswith prior spectroscopic redshifts, we identified redshifts for 113 galaxiesthrough photometric methods and an additional nine sources with lower limits,which allowed a statistically robust determination of the redshiftdistribution. We have resolved 33 AzTEC sources into multi-component systemsand our redshifts suggest that nine are likely to be physically associated. Ouroverall redshift distribution peaks at $z\sim$2.0 with a high redshift tailskewing the median redshift to $\tilde{z}$=2.48$\pm$0.05. We find that brightermillimeter sources are preferentially found at higher redshifts. Our faintestsources, with S$_{1.25 \rm mm}$<1.25 mJy, have a median redshift of$\tilde{z}$=2.18$\pm$0.09, while the brightest sources, S$_{1.25 \rm mm}$>1.8mJy, have a median redshift of $\tilde{z}$=3.08$\pm$0.17. After accounting forspectral energy distribution shape and selection effects these results areconsistent with several previous submillimeter galaxy surveys, and moreover,support the conclusion that the submillimeter galaxy redshift distribution issensitive to survey depth.

An ALMA survey of submillimeter galaxies in the COSMOS field: Multiwavelength counterparts and redshift distribution