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Motivated by the increasing use of the Kennicutt-Schmidt (K-S) star formationlaw to interpret observations of high redshift galaxies, the importance of gasaccretion to galaxy formation, and the recent observations of chemicalabundances in galaxies at z~2-3, I use simple analytical models to assess theconsistency of these processes of galaxy evolution with observations and witheach other. I derive the time dependence of star formation implied by the K-Slaw, and show that the sustained high star formation rates observed in galaxiesat z~2-3 require the accretion of additional gas. A model in which the gasaccretion rate is approximately equal to the combined star formation andoutflow rates broadly reproduces the observed trends of star formation ratewith galaxy age. Using an analytical description of chemical evolution, I alsoshow that this model, further constrained to have an outflow rate roughly equalto the star formation rate, reproduces the observed mass-metallicity relationat z~2.

A Model for Star Formation, Gas Flows and Chemical Evolution in Galaxies at High Redshifts