Characterizing the Baryon Cycle over Cosmic Time

12/13/2019 - 3:30pm to 5:00pm
Speaker(s) / Presenter(s): 
Hsiao-wen Chen, University of Chicago
Type of Event (for grouping events):
Tremendous progress has been made over the last decade in our empirical   
and theoretical understanding of how galaxies form and evolve across
cosmic time.  In particular, state-of-the-art cosmological simulations can
not only match the large-scale statistical properties of galaxies, but
they can also successfully reproduce the observed small-scale features.
However, it appears that these models have fallen short in matching the
empirical properties of diffuse gas in the circumgalactic space, which
constitutes 90% of all baryons in the universe.  The circumgalactic medium
contains the fuel for future star formation and the record of past feedback,
making it uniquely sensitive to the physics of baryonic flows.  I will
summarize recent progress in characterizing this gas reservoir and introduce
new surveys designed to address some of the remaining questions/puzzles.
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