Fallback and Substructure in a Highly-Inclined Ram Pressure Interaction

Galaxies orbiting a galaxy cluster can experience ram pressure winds while moving through the intracluster medium, which can dramatically rearrange and strip away gas and dust from the galaxy disk. The geometry of the interaction can significantly modify its effects, including the overall stripping efficiency, and the morphology of the stripped tail.

Leveraging sub-arcsecond CO(2-1) data of the Coma galaxy NGC 4858 from the ALMA-JELLY large program, with complimentary multi-wavelength data from HST and Subaru, we observe and analyze a wealth of features indicative of a galaxy experiencing a highly inclined ram pressure wind. Using a novel "quadrant" approach, we characterize the interplay between rotation and ram pressure, as well as asymmetric effects on the leading and trailing sides of the galaxy. We find that the inner tail is highly asymmetric, agreeing with predictions from galaxy "wind tunnel" simulations of highly inclined ram pressure.