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In this study we explore the complex multi-phase gas of the circumgalacticmedium (CGM) surrounding galaxies. We propose and implement a novel,super-Lagrangian 'CGM zoom' scheme in the moving-mesh code AREPO, which focusesmore resolution into the CGM and intentionally lowers resolution in the denseISM. We run two cosmological simulations of the same galaxy halo, once with asimple 'no feedback' model, and separately with a more comprehensive physicalmodel including galactic-scale outflows as in the Illustris simulation. Ourchosen halo has a total mass of ~10^12 Msun at z ~ 2, and we achieve a mediangas mass (spatial) resolution of ~2,200 solar masses (~95 parsecs) in the CGM,six-hundred (fourteen) times better than in the Illustris-1 simulation, ahigher spatial resolution than any cosmological simulation at this mass scaleto date. We explore the primary channel(s) of cold-phase CGM gas production inthis regime. We find that winds substantially enhance the amount of cold gas inthe halo, also evidenced in the covering fractions of HI and the equivalentwidths of MgII out to large radii, in better agreement with observations thanthe case without galactic winds. Using a tracer particle analysis to follow thethermodynamic history of gas, we demonstrate how the majority of this cold,dense gas arises due to rapid cooling of the wind material interacting with thehot halo, and how large amounts of cold, ~10^4 K gas can be produced andpersist in galactic halos with Tvir ~ 10^6 K. At the resolutions presentlyconsidered, the quantitative properties of the CGM we explore are notappreciably affected by the refinement scheme.

Zooming in on accretion - II. Cold Circumgalactic Gas Simulated with a super-Lagrangian Refinement Scheme