Yechi Zhang (Caltech/IPAC): "Understanding Gas Outflows in First Galaxies"

Gas outflows are the key to understanding galaxy feedback mechanisms, which strongly regulate the mass assembly of galaxies, especially at early epochs. Galaxy outflows have been extensively studied with different techniques, such as metal absorption lines, emission lines from ionized/neutral gas from optical to sub-mm wavelengths, and absorption features in the background QSO spectra. With JWST, identification and characterization of galaxy outflows through ionized gas has been carried out towards redshift >5, within in the first few hundred million years since the formation of first galaxies. In this talk, I will present the results on ionized gas outflows at z>5 from JWST imaging and spectroscopic data, which give insights into the mechanisms and properties of galaxy outflows in the early universe, providing clues to how they may affect galaxy formation and evolution.