Seminario DAS: Metal enrichment across the Baryon cycle

Speaker: Magdalena Hamel
Affiliation: CAS, Swinburne University of Technology

Abstract: The metal enrichment across the baryon cycle of galaxies is crucial for understanding galaxy evolution. Supernovae expel metal rich gas away from galaxies and inflows inject pristine gas. Simulations show that outflows are the main mechanism in redistributing metals and are key drivers of the chemical enrichment of galaxies and their circumgalactic medium. However, measuring metal abundance is challenging and therefore direct observations are almost completely lacking from the literature. I will present results from ESO/X-shooter, ESO/MUSE and Keck/KCWI where we measure outflow metallicities by detecting the very faint [O III] 4363 auroral line, a robust metallicity tracer, in both the disk and outflow of a sample of galaxies. These observations allow us to estimate the metal loading factor, a critical parameter for realistic simulations and compare with results from absorption line analysis and to recent simulations of metal-enrichment in winds.