Heidelberg Joint Astronomical Colloquium

Speaker Sheila Kannappan
Title The dependence of gas richness and disk building on galaxy mass

Galaxies are known to transition from largely blue and disk-dominated to largely red and spheroid-dominated as they increase in mass across the "bimodality" scale at a stellar mass of about 30 billion Solar masses. I will present converging lines of evidence suggesting that the beginning of this transition occurs at another mass scale of interest: a "threshold" mass at 5 billion Solar masses, where shifts in both gas richness and galaxy structure mark the dwarf/giant galaxy divide. Combining different lines of evidence, I will examine the phenomena and physical processes underlying this transition.