Speaker: Omar Almaini (Nottingham)
I will discuss the strong connection between galaxies and their environments in the high-redshift universe (z>1), as revealed by recent ultra deep surveys. On large scales, studies of galaxy clustering have shown that passive galaxies inhabit the most massive dark matter halos from z=2 to the present day. The precise mechanism responsible for terminating star formation remains unclear, but clustering studies reveal that massive galaxies may shut off their star formation once their host halos achieve a critical mass. On smaller scales, recent deep spectroscopic surveys have allowed the first studies of galactic outflows and the processing of metals in typical high-redshift galaxies. Large-scale outflows appear to be ubiquitous for star-forming galaxies at z>1, with outflow rates comparable to the rates of star formation. There is also evidence for a strong link between outflows, inflows and the evolution in the mass-metallicity relation. The key physical processes are not fully understood, but a picture is gradually emerging of the complex interplay between distant galaxies and their environments.