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We present unprecedented high fidelity radio images of the M87 jet. Weanalyzed Jansky Very Large Array (VLA) broadband, full polarization, radio datafrom 4 to 18 GHz. The observations were taken with the most extendedconfiguration (A configuration), which allow the study of the emission of thejet up to kpc scales with a linear resolution $\sim$10 pc. The high sensitivityand resolution of our data allow to resolve the jet width. We confirm adouble-helix morphology of the jet material between $\sim$300 pc and $\sim$1kpc. We found a gradient of the polarization degree with a minimum at theprojected axis and maxima at the jet edges, and a gradient in the Faraday depthwith opposite signs at the jet edges. We also found that the behavior of thepolarization properties along the wide range of frequencies is consistent withinternal Faraday depolarization. All these characteristics strongly support thepresence of a helical magnetic field in the M87 jet up to 1 kpc from thecentral black hole although the jet is most likely particle dominated at theselarge scales. Therefore, we propose a plausible scenario in which the helicalconfiguration of the magnetic field has been maintained to large scales thanksto the presence of Kelvin-Helmholtz instabilities.

Reading M87's DNA: A Double Helix revealing a large scale Helical Magnetic Field