Mapping Outflows and the CGM in Starbursting Disk Galaxies

I will present results from our recent observations of outflows and the circumgalactic medium (CGM) in star-bursting galaxies from the Keck Cosmic Web Imager. Understanding how gas cycles through galaxies is necessary for describing fundamental aspects of galaxy evolution, such as how the star formation rate evolves over cosmic time. However, outflows are extremely difficult to spatially resolve at z~1-2. Galaxies at z>1 look different to local Milky Way-like spirals, with high star formation surface densities, gas fractions and turbulent motions. We therefore also expect their outflows to be different from those measured in the local universe. Our team is using a rare sample of nearby galaxies with properties well-matched to main-sequence galaxies at z~1-2. We are measuring the spatial distribution of outflows and their chemistry in these galaxies at sub-kpc resolution. Our pilot observations reveal that (1) outflows are ubiquitous, with all lines-of-sight having gas flows at 300pc resolution; and that (2) the strongest outflows are higher than typically observed in local spirals of a similar mass. These results are different from local observations, which find that outflows are concentrated in the centre of galaxies. I also present (3) a novel technique in which we combine the outflow kinematics with measurements of metallicity to identify areas of the galaxy experiencing accretion. This new method allows us to directly observe the details of the accreting gas. For example, we find that accreting gas is more highly ionised than gas in the disk or halo, possibly indicating that it is shocking as it enters the disk.