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Finding and characterising the first galaxies that illuminated the earlyUniverse at cosmic dawn is pivotal to understand the physical conditions andthe processes that led to the formation of the first stars. In the first fewmonths of operations, imaging from the James Webb Space Telescope (JWST) havebeen used to identify tens of candidates of galaxies at redshift (z) greaterthan 10, less than 450 million years after the Big Bang. However, none of thesecandidates has yet been confirmed spectroscopically, leaving open thepossibility that they are actually low-redshift interlopers. Here we presentspectroscopic confirmation and analysis of four galaxies unambiguously detectedat redshift 10.3<z<13.2, previously selected from NIRCam imaging. The spectrareveal that these primeval galaxies are extremely metal poor, have massesbetween 10^7 and a few times 10^8 solar masses, and young ages. The dampingwings that shape the continuum close to the Lyman edge are consistent with afully neutral intergalactic medium at this epoch. These findings demonstratethe rapid emergence of the first generations of galaxies at cosmic dawn.

Spectroscopic confirmation of four metal-poor galaxies at z=10.3-13.2