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High resolution (1'' $\times$ 2'') ALMA CO(2-1) observations of the rampressure stripped galaxy NGC 4402 in the Virgo cluster show some of theclearest evidence yet for the impacts of ram pressure on the molecular ISM of agalaxy. The eastern side of the galaxy at $r \sim 4.5$ kpc, upon which rampressure is incident, has a large (width $\sim$1 kpc, height $\sim$1 kpc abovethe disk midplane) extraplanar plume of molecular gas and dust. Molecular gasin the plume region shows distinct non-circular motions in the direction of theram pressure; the kinematic offset of up to 60 km s$^{-1}$ is consistent withacceleration by ram pressure. We also detect a small amount of gas in cloudsbelow the plume that are spatially and kinematically distinct from thesurrounding medium, and appear to be decoupled from the stripped ISM. Wepropose that diffuse molecular gas is directly stripped but GMC density gas isnot directly stripped, and so decouples from lower density stripped gas.However, GMCs become effectively stripped on short timescales. We also findmorphological and kinematic signatures of ram pressure compression of moleculargas in a region of intense star formation on the leading side at $r \sim 3.5$kpc. We propose that the compressed and stripped zones represent differentevolutionary stages of the ram pressure interaction, and that feedback fromstar formation in the compressed zone facilitates the effective stripping ofGMCs by making the gas cycle rapidly to a lower density diffuse state.

ALMA evidence for ram pressure compression and stripping of molecular gas in the Virgo cluster galaxy NGC 4402