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Abstract: We present a self-consistent MHD model for the jet of M87. The model consistof two distinct zones: an inner relativistic outflow, which we identify withthe observed jet, and an outer cold disk-wind. While the former does notself-collimate efficiently due to its high effective inertia, the latterfulfills all the conditions for efficient collimation by themagneto-centrifugal mechanism. Given the right balance between the effectiveinertia of the inner flow and the collimation efficiency of the outer diskwind, the relativistic flow is magnetically confined into a well collimatedbeam for a wide range of parameters and matches the measurements of the openingangle of M87 over several orders of magnitude in spatial extent.In the second part of this work, we present synthetic synchrotron emissionmaps for our MHD models. In principle the two-zone model can reproduce themorphological structure seen in radio observations, as central-peaked profilesacross the jet close the the source, limb-bright further down the jet, and abright knot close to the position of HST-1. However it is difficult toreconcile all features into a single set of parameters.

Autor: J. Gracia, S. Bogovalov, K. Tsinganos



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