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We report new 2 cm VLBA images of the inner radio jet of M87 showing a limbbrightened structure and unambiguous evidence for a faint 3 mas longcounter-feature which also appears limb brightened. Multi-epoch observations ofseven separate jet features show typical speeds of less than a few percent ofthe speed of light, despite the highly asymmetric jet structure and theimplications of the canonical relativistic beaming scenario. The observedmorphology is consistent with a two stream spine-sheath velocity gradientacross the jet, as might be expected from the recently discovered strong andvariable TeV emission as well as from numerical modeling of relativistic jets.Considering the large jet to counter-jet flux density ratio and lack ofobserved fast motion in the jet, we conclude that either the inner part of theM87 jet is intrinsically asymmetric or that the bulk plasma flow speed is muchgreater than any propagation of shocks or other pattern motions.

The Inner Jet of the Radio Galaxy M87