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Dwarf galaxies are affected by all the evolutionary processes normally atwork in galaxies of any mass. As fainter and less massive galaxies, however,dwarf galaxies are particularly susceptible to environmental mechanisms thatcan more easily perturb these systems. Importantly, the presence of nearbylarge galaxies are expected to have a profound effect on dwarf galaxies.Gravitational (especially tidally-induced) effects from the large galaxy cancause mass to be lost from the dwarf, and the passage of the dwarf through thegaseous medium surrounding the large galaxy can additionally cause the dwarf tolose its own gas through a process called ram pressure stripping. Such effectsare considered to be the main sources of difference between "satellite" and"field" dwarf galaxy populations. Here, we report on new observations of thegaseous content of Wolf-Lundmark-Melotte (WLM), an archetype of isolated,gas-rich field dwarf galaxies in the Local Universe, which shows a much morecomplex situation. Previous studies of its gaseous disk suggest it hasperturbed kinematics; here, we identify four trailing, extended gas clouds inthe opposite direction to WLM's spatial motion, as well as a spatial offsetbetween the WLM gas and stars. Overall, the morphology and kinematics of thisgas shows that WLM is undergoing ram pressure stripping, despite being 930 and830 kpc from the Milky Way and M31, respectively. This finding indicates thepresence of an inter-galactic, gaseous reservoir far from large galaxies whoseevolutionary role on galaxies, both large and small, may not be fullyappreciated.

Evidence of ram pressure stripping of WLM, a dwarf galaxy far away from any large host galaxy