Hsi-Yu Schive

JWST evidence for a sharp ``Cosmic Daybreak" at z=15

Abstract Luminous young galaxies have been uncovered with relative ease by JWST, extending to z=14.5, so it is puzzling that deeper spectroscopy of fainter candidates now finds only interlopers. This redshift `ìmpasse" is underscored by the measured stellar ages of these high-z g...