CONICET | Buscador de Institutos y Recursos Humanos

Perturbations to the axisymetric potential can be present in the galactic discs, such as warps. In this work, we generate simple models of discs with this perturbation in order to analyze the effect of warps on the rotation curve, and their influence on the mass determination. We study two different kinds of warps. One of them take place on the external radii of the galaxies, and the other is present over the entire disc. In the last case, the global warp, the rotation curve is perturbed mainly in the middle region of the disk. In the first case, the external warp, the perturbation produce a velocity growth in the external region of the rotation curve, which e®ect could be erroneously interpreted as the presence of a dark matter halo.