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The interaction between the supersonic motion of the Large Magellanic Cloud(LMC) and the Circumgalactic Medium (CGM) is expected to result in a bow shockthat leads the LMC's gaseous disk. In this letter, we use hydrodynamicsimulations of the LMC's recent infall to predict the extent of this shock andits effect on the Milky Way's (MW) CGM. The simulations clearly predict theexistence of an asymmetric shock with a present day stand-off radius of$\sim6.7$ kpc and a transverse diameter of $\sim30$ kpc. Over the past 500 Myr,$\sim8\%$ of the MW's CGM in the southern hemisphere should have interactedwith the shock front. This interaction may have had the effect of smoothingover inhomogeneities and increasing mixing in the MW CGM. We find observationalevidence of the existence of the bow shock in recent $H\alpha$ maps of the LMC,providing a potential explanation for the envelope of ionized gas surroundingthe LMC. Furthermore, the interaction of the bow shock with the MW CGM may alsoexplain observations of ionized gas surrounding the Magellanic Stream. Usingrecent orbital histories of MW satellites, we find that many satellites havelikely interacted with the LMC shock. Additionally, the dwarf galaxy Ret2 iscurrently sitting inside the shock, which may impact the interpretation ofreported gamma ray excess in Ret2. This work highlights bow shocks associatedwith infalling satellites are an under-explored, yet potentially very importantdynamical mixing process in the circumgalactic and intracluster media.

The Large Magellanic Cloud's $\sim30$ Kiloparsec Bow Shock and its Impact on the Circumgalactic Medium