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We investigate the influence of ram-pressure stripping on the internal gaskinematics of simulated spiral galaxies. Additional emphasis is put on thequestion of how the resulting distortions of the gaseous disc are visible inthe rotation curve and/or the full 2D velocity field of galaxies at differentredshifts. A Milky-Way type disc galaxy is modelled in combinedN-body/hydrodynamic simulations with prescriptions for cooling, star formation,stellar feedback, and galactic winds. This model galaxy moves through aconstant density and temperature gas, which has parameters similar to theintra-cluster medium (ICM). Rotation curves (RCs) and 2D velocity fields of thegas are extracted from these simulations in a way that follows the procedureapplied to observations of distant, small, and faint galaxies as closely aspossible. We find that the appearance of distortions of the gaseous disc due toram-pressure stripping depends on the direction of the acting ram pressure. Inthe case of face-on ram pressure, the distortions mainly appear in the outerparts of the galaxy in a very symmetric way. In contrast, in the case ofedge-on ram pressure we find stronger distortions. The 2D velocity field alsoshows signatures of the interaction in the inner part of the disc. At anglessmaller than 45 degrees between the ICM wind direction and the disc, thevelocity field asymmetry increases significantly compared to larger angles.Compared to distortions caused by tidal interactions, the effects ofram-pressure stripping on the velocity field are relatively low in all casesand difficult to observe at intermediate redshift in seeing-limitedobservations. (abridged)

The effects of ram-pressure stripping on the internal kinematics of simulated spiral galaxies