Collimation of the jet and counterjet



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Collimation of the jet and counterjet

 Four jet collimation measures
Figure 5:  Four jet collimation measures, showing little spreading.

Figure 5 plots four measures of the width   of the main jet against distance from the nucleus, wherever the uncertainty in the estimate is < 0.5/h kpc. By all four measures, including the separation of the polarization ``rails'', the jet expands only slowly, if at all, over most of its length. Both jets can be described as features that are roughly constant (~ 1.5/h kpc) in width, containing narrower bright knots which locally perturb the individual width measures.



abridle@nrao.edu