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The evolution of optical strong lines across cosmic time

Lisa KEWLEY
(Australian National University)

We combine cosmological hydrodynamic simulations with stellar population synthesis, photoionization, and shock models to predict the stromlo line evolution of ensembles of galaxies from z=3 to the present day. We compare our theoretical predictions with near-infrared spectroscopic observations of COSMOS galaxies and gravitationally lensed galaxies. We show that the star-formation and ISM conditions in star-forming galaxies changes significantly from z~3 to z~1, while galaxies at z~1 have reached star formation/ISM conditions that are similar to local galaxies. We show that ongoing and future near-infrared spectroscopic observations of COSMOS galaxies can place important constraints on the cosmic evolution of metallicity gradients in AGN.


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