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We examine the redshift evolution of standard strong emission-linediagnostics for Hbeta-selected star-forming galaxies using the local SDSSsample and a new z = 0.2 - 2.3 sample obtained from HST WFC3 grism and KeckDEIMOS and MOSFIRE data. We use the SDSS galaxies to show that there is asystematic dependence of the strong emission-line properties on Balmer-lineluminosity, which we interpret as showing that both the N/O abundance and theionization parameter increase with increasing line luminosity. Allowing for theluminosity dependence tightens the diagnostic diagrams and the metallicitycalibrations. The combined SDSS and high-redshift samples show that there is noredshift evolution in the line properties once the luminosity correction isapplied, i.e., all galaxies with a given L(Hbeta) have similar strongemission-line distributions at all the observed redshifts. We argue that thebest metal diagnostic for the high-redshift galaxies may be aluminosity-adjusted version of the [NII]6584/Halpha metallicity relation.

Luminosity Dependence and Redshift Evolution of Strong Emission-line Diagnostics in Star-Forming Galaxies