University of Minnesota
School of Physics & Astronomy

Physics and Astronomy Calendar

Friday, November 6th 2015
2:30 pm:
Speaker: Charlotte Christensen, Grinnell University
Subject: Outflows and galactic recycling

The cycling of gas through galactic fountains links disks to halos. Here I use a suite of high-resolution simulations of galaxy formation to follow the outflow and re-accretion of gas. These simulations self-consistently generate outflows from the available supernova energy in a manner that successfully reproduces key galaxy observables including the stellar mass-halo mass, Tully-Fisher, and mass-metallicity relations. From them one can quantify the importance of ejective feedback, relative to the efficiency of gas accretion and star formation, to setting the stellar mass. I show that ejective feedback is increasingly important as galaxy mass decreases and that the effective mass loading factor is independent of redshift. By examining spatially-resolved gas loss and accretion, I show the extent to which outflows redistribute baryons through the disk and what fraction of outflowing material is later recycled.

The weekly calendar is also available via subscription to the physics-announce mailing list, and by RSS feed.