Evolution of the Mass-Metallicity Relation from Redshift $z\approx8$ to the Local Universe

Understand

A tight positive correlation between the stellar mass and the gas-phase metallicity of galaxies has been observed at low redshifts.

• The redshift evolution of this correlation can strongly constrain theories of galaxy evolution.
• The advent of JWST allows probing the mass-metallicity relation at redshifts far beyond what was previously accessible.
• Here we report the discovery of two emission-line galaxies at redshifts 8.15 and 8.16 in JWST NIRCam imaging and NIRSpec spectroscopy of targets gravitationally lensed by the cluster RXJ2129.4$+$0005.