The chemical evolution of galaxies across cosmic time
Event date
Speaker
Tucker Jones
Affiliation
UC Davis
Location
Online
Event Type
Colloquium

What is the heavy element content of the Universe? 
Chemical evolution of galaxies is a powerful probe of their assembly, and of the cycle of baryons between galaxies and the intergalactic medium. However, current measurements based on oxygen abundance are uncertain by a factor of 2, and many common diagnostics suffer from systematic offsets at high redshift. I will discuss efforts to establish the absolute gas-phase metallicity scale at low redshift and appropriate calibrations at high redshifts, including direct temperature-based measurements up to z~8. This in turn allows us to understand how the processes of accretion, star formation, and feedback govern the growth of galaxies across cosmic history. SOFIA plays a critical role as the only facility which can access key infrared spectral features for nearby galaxies.

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