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Large scale surveys of the prominent members of the Local Group have providedcompelling evidence for the hierarchical formation of massive galaxies,revealing a wealth of substructure that is thought to be the debris fromancient and on-going accretion events. In this paper, we compare two extantsurveys of the M31-M33 subgroup of galaxies; the Pan-Andromeda ArchaeologicalSurvey (PAndAS) of the stellar structure, and a combination of observations ofthe HI gaseous content, detected at 21cm. Our key finding is a marked lack ofspatial correlation between these two components on all scales, with only a fewpotential overlaps between stars and gas.The paucity of spatial correlationsignificantly restricts the analysis of kinematic correlations, although theredoes appear to the HI kinematically associated with the Giant Stellar Streamwhere it passes the disk of M31. These results demonstrate that that differentprocesses must significantly influence the dynamical evolution of the stellarand HI components of substructures, such as ram pressure driving gas away froma purely gravitational path. Detailed modelling of the offset between thestellar and gaseous substructure will provide a determination of the propertiesof the gaseous halo of M31 and M33.

PAndAS in the mist: The stellar and gaseous mass within the halos of M31 and M33