Astronomy Tea Talk

Hydrodynamical cosmological simulations indicate that massive galaxies at high redshift are fed by extended streams of cold gas in a smooth component and in merging galaxies. At the same time, observations reveal that winds are ubiquitous in star forming systems. To investigate this balanced cycle of gas in high-redshift galaxies, I will present predictions of the neutral hydrogen distribution and Ly-alpha emission in simulated disks fed by cold-streams. I will then discuss the prospects of mapping the circumgalactic medium with absorption line systems or with imaging and spectroscopy in emission, presenting preliminary results from ongoing programs.