The interstellar medium (ISM) is multi-phase, turbulent, and magnetic. This makes the ISM an ideal laboratory for studying the multi-scale physics of star formation and galactic evolution. This also makes the ISM a formidable foreground for cosmology experiments, such as the search for inflationary gravitational wave B-mode polarization in the cosmic microwave background (CMB). I will discuss recent work on magnetic fields in the diffuse ISM, with a focus on insights from high-dynamic range observations of neutral hydrogen and polarized dust emission. Novel tools for quantifying the morphology of interstellar material are enabling new probes of the ambient magnetic field structure, and a better understanding of how the magnetic field is linked to the phase structure of the ISM. We are using these insights to build data-driven models of the polarized dust emission from the three-dimensional ISM.
Order Lunch (As a reminder, lunch is now catered by IQuisine, and consists of a selection of sandwiches and a side salad).