Redshift Distribution and Physical Properties of z > 4 Dusty, Star-forming Galaxies with ALMA

Dusty star-forming galaxies (DSFGs) at high redshifts are the key to understanding early galaxy formation and evolution.While DSFGs at z > 4 are rare, galaxy formation and evolution models suggest that they are the predecessor of massive, red and dead galaxies at z ~1-3. While candidate DSFGs at z > 4 exist from far-IR and sub-mm continuum imaging surveys, it is difficult to determine their exact redshifts without mm-wave spectroscopy. Due to large amounts of dust the rest-frame optical emission is highly attenuated, limiting traditional optical spectroscopic observations to determine redshifts. In this poster, we provide results on 37 DSFGs selected from sub-mm colors to be at z > 4 with mm-wave spectroscopic observations with the Atacama Large Millimeter/submillimeter Array (ALMA). Our data consists of ALMA Band-3 spectral scans of 37 sources. The data are analyzed to determine the properties of galaxy star-formation rate, dust abundance, and spectroscopic redshifts. With such information, we are able to fully understand the physical properties of these galaxies and connect them to massive galaxies at lower redshifts.