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The recent discovery of diffuse dwarf galaxies that are deficient in darkmatter appears to challenge the current paradigm of structure formation in ourUniverse. We describe the numerical experiments to determine if the so-calleddark matter deficient galaxies (DMDGs) could be produced when two gas-rich,dwarf-sized galaxies collide with a high relative velocity of $\sim 300\,{\rmkms^{-1}}$. Using idealized high-resolution simulations with both mesh-basedand particle-based gravito-hydrodynamics codes, we find that DMDGs can form ashigh-velocity galaxy collisions separate dark matter from the warm disk gaswhich subsequently is compressed by shock and tidal interaction to form stars.Then using a large simulated universe IllustrisTNG, we discover a number ofhigh-velocity galaxy collision events in which DMDGs are expected to form.However, we did not find evidence that these types of collisions actuallyproduced DMDGs in the TNG100-1 run. We argue that the resolution of thenumerical experiment is critical to realize the "collision-induced" DMDGformation scenario. Our results demonstrate one of many routes in whichgalaxies could form with unconventional dark matter fractions.

Dark Matter Deficient Galaxies Produced Via High-velocity Galaxy Collisions In High-resolution Numerical Simulations