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I reexamine recent observations of velocity profiles across jets blown byyoung stellar objects, and argue that the observations do not support theinterpretation of jets rotating around their symmetry axes. Instead, I proposethat the interaction of the jets with a twisted-tilted (wrapped) accretion diskcan form the observed asymmetry in the jets' line of sight velocity profiles.The proposed scenario is based on two plausible assumptions. (1) There is aninclination between the jet and the outer parts of the disk; the jet isperpendicular to the inner part of the disk; Namely, there is a twisted-tilted(wrapped) disk. (2) The disk-jet interaction slows down the jet as the jetentrains mass from the disk, with larger decelaration of jet segments closer tothe tilted disk. The proposed scenario can account for the basic properties ofthe observed velocity profiles, while having the advantage that there is noneed to refer to any magnetic jet launching model, and there is no need toinvoke jet rotation with a huge amount of angular momentum.Comment: Astronomy and Astrophysics, in press (contains an appendix which is  not in A&A

Interaction of young stellar object jets with their accretion disk