Radio Signatures of Ram Pressure Sweeping in Low Galaxy Density Environs

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Scientific paper

Gas stripping mechanisms such as ram pressure sweeping are commonly observed in rich clusters of galaxies which contain substantial matter in the ICM and velocity dispersion is high. The signs on radio emission that are commonly attributed to ram pressure are asymmetric and swept up features in the gas disk. Such features have also been observed in galaxies in small groups and outskirts of clusters where X-ray emission shows the hot ICM has low densities but difficult to attribute them to ram pressure stripping. Generally mechanisms which can aid ram pressure are proposed: tidal interaction or winds due to star formation. In this paper, we review results obtained from radio observations of a few systems and discuss these in context of physical mechanisms active in such systems.

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