The build-up of Massive Dusty Star-forming Galaxies at Cosmic Noon as seen by ALMA and JWST

ABSTRACT :
Dusty star-forming galaxies (DSFGs) are infrared luminous galaxies that host most of the cosmic star formation rates across over 85% of the cosmic time, and they are massive systems that are thought to be connected with those in the epoch of deionization recently discovered by JWST, as well as massive elliptical galaxies in the nearby Universe. Despite playing a pivotal role in massive galaxy formation theory, key questions related to the DSFGs are still debated. How are they formed? What is the physics that drives their intensive star formation rates that are often hundreds times more than those in the Milky Way? Is it driven by violent disk instability? or gas dissipation via dynamical interactions? In this talk I will present some of our recent findings that are based on ALMA and JWST, showing that possibly all the proposed formation channels contribute to the more efficient star formation efficiency observed in this population, and these mechanisms may also lead to the active formation of bulge-like structures that are now often seen in the JWST images.