RSAA Colloquia / Seminars / Feast-of-Facts: Friday, 21 November 2014, 14:00-14:20; Duffield Lecture Theatre

Diane Salim

"Metallicity Calibrations and Gradients in SAMI Star-forming Galaxies"

Sophisticated chemical evolution models have been successful in reproducing the current abundance gradient in our Milky Way and other nearby galaxies, but these models produce dramatically conflicting predictions for galaxies at intermediate distances and in the early universe. One major problem with this work is that metallicity calibrations have been hindered by large discrepancies, particularly between diagnostics that use different sets of emission-lines, and these discrepancies are not well understood. Fortunately, large integral field spectroscopic surveys offer the first large local datasets to resolve this issue and in this project, 6 different metallicity calibrations were applied to a star-forming galaxies from the SAMI galaxy survey.