Fig. 3: Cen A collimation profile derived from the final model.
From: Event Horizon Telescope observations of the jet launching and collimation in Centaurus A
Top: the jet width W as a function of apex distance z, overplotted with a W(z) = Azk least-squares fit, with k = 0.33 ± 0.05|stat ± 0.06|sys (‘Collimation profile’ in Methods). Here, A is a nuisance parameter. The systematic error has been derived based on the uncertainty in the apex position. The error bars are derived from a 5 μas 1σ statistical uncertainty on each pixel in the model. Bottom: the corresponding jet opening angle between the apex and the two jet arms, which becomes unreliable at z ≲ zcol = 32 μas due to instrumental resolution limitations (see text). The transition region is indicated with a vertical blue dashed line. A base-10 logarithmic scale is used for the horizontal axis.
