Dr. Sinclaire Manning (University of Massachusetts)

Within the last few years, an increasing number of works have uncovered a subsample of dusty star-forming galaxies (DSFGs), characterized by non-detections in deep optical and near-infrared (NIR) surveys and robust dust emission in the (sub-)millimeter regime. These extremely dust-obscured and high redshift (z>4) “NIR-dark” DSFGs have since been proposed to make up roughly 25% of all DSFGs and are thought to be the progenitors of z>3 quiescent galaxies. Now with JWST operational, a natural extension to this area of exploration has been prompted: are there JWST-dark galaxies? We present eight dust-obscured “JWST-faint” galaxies (F150W dropouts) found in the first COSMOS-Web release. First identified as targets with >4 sigma detections in SCUBA-2 850 micron maps, high-resolution ALMA detections were then used to accurately pinpoint NIR JWST counterparts. Three of these galaxies are of particular interest due to their exceedingly red colors and high redshift (z>5) estimates. We will discuss the derived physical properties of this heavily obscured galaxy population, their contribution to cosmic star formation, and contextualize them with other studies of NIR-dark galaxies before looking ahead to future expansion of this work as the full COSMOS-Web survey becomes available.