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This Week at Physics

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Event Number 5229

  Thursday, November 7th, 2019

Astronomy Colloquium
"Star Formation and Nuclear Activity: Dwarf Galaxies to Ultraluminous Infrared Galaxies"
Time: 3:30 pm
Place: 4421 Sterling Hall, Coffee and cookies 3:30 PM, Talk begins 3:45 PM
Speaker: George Privon, University of Florida
Abstract: The stellar mass of star forming galaxies is thought to increase in a quasi-steady state, where the rate depends on the gas fraction and star formation efficiency, which evolve with redshift. Galaxy mergers can lead to more rapid growth while active galactic nuclei have been argued to play an important role in halting star formation. These processes are tied together through the multi-phase interstellar medium. I will discuss programs exploring so-called "dense gas" tracers and the behavior of starbursts in merging dwarf galaxies. I will also describe a theoretical/modeling program to use galaxy formation simulations as "ground truth" for interpreting observational tracers of the ISM. This use of multiwavelength tracers and hydrodynamic simulations probes galaxy evolution along axes of nuclear activity, redshift, gas fraction, and metallicity. From these studies I will show new results on identification of heavily obscured AGN and intriguing differences in how mergers affect the evolution of high gas fraction galaxies.
Host: Professor Emeritus Jay Gallagher
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