The even columns show the comparisons of í µí± t from the calculations based on equation (1) (Section 3.1) and the measurements from observations (Section 3.2). Half of the disc facing directly the ICM wind, i.e., the leading side, is indicated in yellow, whereas the tail side is shaded in grey. The small arrow on the upper right points the opposite direction of M87. The purple line indicates the surface density of 1 í µí± /pc −2 based on which the observational í µí± t is defined. In the odd columns, the total H intensity of each target is shown by white contours overlaid on the SDSS i−band image. observation) of active RPS cases, i.e., Class II of Yoon et al. Otherwise, more careful inspections on the second mechanism and local environment are required to assess the impact of RPS on the target.Ĭomparison of í µí± t (prediction vs. Our results imply that the conventional RPS relation works reasonably well in a broad sense when RPS is the most dominant process and the galaxy is located where the surrounding environment can be well defined. On the other hand, galaxies likely in the early or later RPS stage and/or the ones with signs of environmental impacts other than RPS such as tidal interaction or starvation, show some discrepancies. For the sample undergoing active RPS, we generally find good agreements between predictions and observations within a measurement uncertainty. In order to verify how well the observed signatures of the RPS process can be understood as simple momentum transfer, we compare the stripping radii of Virgo cluster galaxies in different stages of RPS measured from the HI observation with the predicted gas truncation radii for the given conditions. However, the actual gas stripping process can be more complicated due to the complexity of gas physics such as compression and geometrical self-shielding as well as cooling and heating. The RPS process is commonly described as a competition between the ram pressure by the intracluster medium (ICM) and the anchoring pressure on the interstellar medium (ISM) by the gravitational potential of a galaxy. Ram pressure stripping (RPS) is known to be a key environmental effect that can remove interstellar gas from galaxies in a cluster.
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