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The low-redshift mass-metallicity relation (MZR) is well studied, but thehigh-redshift MZR remains difficult to observe. To study the early MZR further,we analyze the Cosmic Reionization on Computers (CROC) simulations with a focuson the MZR from redshifts 5 to 10. We find that, across all redshifts, CROCgalaxies exhibit similar stellar-phase and gas-phase MZRs that flatten withhigher stellar mass. We attribute this flattening to the inaccurate starformation and feedback modeling in CROC (star formation is overly suppressed inmassive CROC galaxies). In addition, we show that the ratio between stellarmetallicity and gas metallicity ($Z_*/Z_{gas}$) decreases as stellar ageincreases, meaning that in CROC galaxies, gas accretion rate is lower thanmetal production rate. With JWST we will be able to compare our predictions toobservations of the Epoch of Reionization and understand better early galaxyformation.

Mass-Metallicity Relation during the Epoch of Reionization in the CROC Simulations