7.3 Implications for unified models

We have also calculated the change in appearance of our model brightness and polarization distributions as functions of orientation. These are in good qualitative agreement with observations of other well-observed jets and we therefore expect the model (with some parameter variations) to apply to FRI jets in general. Figures 23 and 24 show that the intensity changes are considerably more complex than would be expected for single-velocity jets. They emphasize the need for high dynamic range and sensitivity to possible wide-angle jet structures when assessing whether observed jet properties are consistent with unified models. We predict changes in polarization with orientation (Figure 25): these provide an independent test of unified models provided that our proposed field configuration is present in all FRI jets.