- Broida 3302
Mark Dijkstra (MPA)
The standard cosmological model successfully reproduces the observed large scale distribution of matter in the Universe. In contrast, on much smaller scales the process of galaxy formation is still poorly understood. The amount of observational data on intermediate scales - which are often referred to as the circumgalactic medium (CGM) - has increased enormously in recent years. I will discuss our efforts to model the existing data on the CGM in the HI Lyman alpha line, which illustrate that the composition of the CGM is still poorly understood. Fortunately, several instruments will be commissioned in the near future that will allow us to map out the CGM more routinely. Having a more complete & consistent picture of the CGM will revolutionize our understanding of galaxy formation.